Add semicolon

Build/Assets/Scss/base/_variables.scss

@@ -784,4 +784,4 @@ $navbar-brand-padding-y: 0;
 // $pre-color:                         $gray-900 !default;
 // $pre-scrollable-max-height:         340px !default;
 
-$slick-loader-path: "/typo3conf/ext/Resources/Public/Images/ajax-loader.gif"
+$slick-loader-path: "/typo3conf/ext/Resources/Public/Images/ajax-loader.gif";