Fix emoji size to be congruent

Author: pickfire

src/librustdoc/html/static/rustdoc.css

@@ -796,10 +796,6 @@ body.blur > :not(#help) {
 	display: list-item;
 }
 
-.stab .emoji {
-	font-size: 1.5em;
-}
-
 .module-item .stab {
 	border-radius: 3px;
 	display: inline-block;