style(light-theme): make text-color-weak a little bit darker

otherwise its not possible to see which queries are disabled
in the query editor

public/sass/_variables.light.scss

@@ -60,7 +60,7 @@ $page-bg:  		  		    $white;
 $body-color:    		    $gray-1;
 $text-color:    		    $gray-1;
 $text-color-strong:	    $white;
-$text-color-weak: 	    $gray-1;
+$text-color-weak: 	    $gray-2;
 $text-color-faint:      $gray-3;
 $text-color-emphasis: 	$dark-5;