Remove unnecessary rules and properties

Active state is already covered with `mw-ui-button`. Color needs to
become darker for better contrast ratio when button is toggled.

Change-Id: If888a862c0b642aaa200e8207f3804f76f05b8b0

resources/css/ext.uls.compactlinks.less

@@ -23,10 +23,8 @@
 	cursor: pointer;
 }
 
-.mw-interlanguage-selector:active,
 .mw-interlanguage-selector.selector-open {
 	background-color: #c8ccd1;
-	color: #54595d;
 }
 
 .interlanguage-uls-menu {