Use WCAG level AA conforming WikimediaUI color

Applying WCAG level AA conforming WikimediaUI color `#54595d`
instead of library out-of-box one.

Change-Id: I6cbce473f1235bb29dac95e8129445e8bf0a8c20

resources/css/ext.uls-vector.less

@@ -15,4 +15,8 @@
 	.uls-filtersuggestion {
 		color: #72777d;
 	}
+
+	.uls-lcd-region-title {
+		color: #54595d;
+	}
 }