Fix import of bootswatch styles

Author: rosier

assets/styles/_variables.scss

@@ -22,5 +22,3 @@ $btn-padding-y: 15px;
 $btn-padding-x: 10px;
 $btn-padding-y-sm: 9px;
 $btn-padding-x-sm: 6px;
-
-@import "./bootswatch/_variables.scss";

assets/styles/app.scss

@@ -1,4 +1,5 @@
 @import "variables";
+@import "./bootswatch/variables";
 
 @import "../../vendor/twbs/bootstrap/scss/bootstrap.scss";
 @import "./bootswatch/bootswatch";