Remove the colon in starterkit for inline labels

Closes #3482212

core/themes/starterkit_theme/css/components/field.css

@@ -20,6 +20,3 @@
   padding-right: 0;
   padding-left: 0.5em;
 }
-.field--label-inline .field__label::after {
-  content: ":";
-}