Revert max line length change

Do not chnage default line length as it is a breaking chnage.
Library configuration can be used to adjust max lien length.

Author: Arto Kinnunen

features/frameworks/mbed-client-cli/mbed_lib.json

@@ -42,7 +42,7 @@
       "value": null
     },
     "max_line_length": {
-      "help": "maximum input line length. Defaults to 200 when not set",
+      "help": "maximum input line length. Defaults to 2000 when not set",
       "value": null
     },
     "args_max_count": {

features/frameworks/mbed-client-cli/source/ns_cmdline.c

@@ -215,7 +215,7 @@
 #endif
 // Maximum length of input line
 #ifndef MBED_CONF_CMDLINE_MAX_LINE_LENGTH
-#define MBED_CONF_CMDLINE_MAX_LINE_LENGTH 200
+#define MBED_CONF_CMDLINE_MAX_LINE_LENGTH 2000
 #endif
 // Maximum number of arguments in a single command
 #ifndef MBED_CONF_CMDLINE_ARGS_MAX_COUNT