Remove some invalid syntax tests

Prepare for some more lazy CSS parsing by
sublimehq/Packages#3831

Author: deathaxe

tests/syntax_test_css.less

@@ -437,12 +437,6 @@
 /*            ^^^^^^^^ support.constant.property-value.css */
 /*                    ^ punctuation.terminator.rule.css */
 
-        font-family: ;
-/*     ^^^^^^^^^^^^^^^^^^^^^^^^ meta.at-rule.page.css meta.property-list.css meta.block.css */
-/*      ^^^^^^^^^^^ - support.type */
-/*                 ^ punctuation.separator.key-value.css */
-/*                   ^ punctuation.terminator.rule.css */
-
         @top-left-corner { margin: 5pt; }
 /*      ^^^^^^^^^^^^^^^^^ meta.at-rule.page.css meta.property-list.css meta.block.css meta.at-rule.margin.css */
 /*                       ^^^^^^^^^^^^^^^^ meta.at-rule.page.css meta.property-list.css meta.block.css meta.at-rule.margin.css meta.property-list.css meta.block.css */
@@ -515,37 +509,13 @@
 /*      ^ keyword.control.directive.css punctuation.definition.keyword.css */
 /*       ^^^^^^^^^^^^ keyword.control.directive.css - punctuation */
 
-        @right-bottom { font-family: ; }
-/*      ^ keyword.control.directive.css punctuation.definition.keyword.css */
-/*       ^^^^^^^^^^^^ keyword.control.directive.css - punctuation */
-/*                    ^^^^^^^^^^^^^^^^^^ meta.at-rule.page.css meta.property-list.css meta.block.css meta.at-rule.margin.css meta.property-list.css meta.block.css */
-/*                    ^ punctuation.section.block.begin.css */
-/*                      ^^^^^^^^^^^ - support.type */
-/*                                 ^ punctuation.separator.key-value.css */
-/*                                   ^ punctuation.terminator.rule.css */
-/*                                     ^ punctuation.section.block.end.css */
-
-        { margin: 5pt; }
-/*     ^^^^^^^^^^^^^^^^^^ meta.at-rule.page.css meta.property-list.css meta.block.css - meta.block meta.block */
-/*      ^ invalid.illegal.unexpected-token.css */
-/*                     ^ invalid.illegal.unexpected-token.css */
     }
 /*  ^ meta.at-rule.page.css meta.property-list.css meta.block.css punctuation.section.block.end.css*/
 
     @right-bottom { margin: 5pt; }
 /*  ^ keyword.control.directive.css punctuation.definition.keyword.css */
 /*   ^^^^^^^^^^^^ keyword.control.directive.css - punctuation */
 
-    @media onlyℜ screenℜ screen\211C {}
-/*  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ meta.at-rule.media.css - meta.block */
-/*                                   ^^ meta.at-rule.media.css meta.block.css - meta.property-list */
-/*                                     ^ - meta.at-rule - meta.block */
-/*  ^ keyword.control.directive.css punctuation.definition.keyword.css */
-/*   ^^^^^ keyword.control.directive.css - punctuation */
-/*         ^^^^^^^^^^^^^^^^^^^^^^^^^ - keyword - support */
-/*                                   ^ punctuation.section.block.begin.css */
-/*                                    ^ punctuation.section.block.end.css */
-
     @media only screen {}
 /*  ^^^^^^^^^^^^^^^^^^^ meta.at-rule.media.css - meta.block */
 /*                     ^^ meta.at-rule.media.css meta.block.css - meta.property-list */
@@ -1182,12 +1152,6 @@
 /*                 ^ punctuation.separator.key-value.css */
 /*                   ^^^^^^^ meta.property-value.css constant.other.color.rgb-value.css */
 /*                          ^ punctuation.terminator.rule.css */
-      font: value;
-/*   ^^^^^^^^^^^^^^ meta.at-rule.property.css meta.property-list.css meta.block.css */
-/*    ^^^^ - meta.property-name - support.type.property-name */
-/*        ^ punctuation.separator.key-value.css */
-/*          ^^^^^ meta.property-value.css support.constant.property-value.css */
-/*               ^ punctuation.terminator.rule.css */
 }
 
     @scroll-timeline