rustdoc: simplify CSS selectors for item table .stab

The module-item and import-item classes are attached to the item-left.
Just target that, instead.

Author: notriddle

src/librustdoc/html/static/css/rustdoc.css

@@ -212,8 +212,7 @@ pre.rust a,
 .mobile-topbar h2 a,
 h1 a,
 .search-results a,
-.module-item .stab,
-.import-item .stab,
+.item-left .stab,
 .result-name .primitive > i, .result-name .keyword > i {
 	color: var(--main-color);
 }
@@ -1010,8 +1009,7 @@ so that we can apply CSS-filters to change the arrow color in themes */
 		0 -1px 0 black;
 }
 
-.module-item .stab,
-.import-item .stab {
+.item-left .stab {
 	border-radius: 3px;
 	display: inline-block;
 	font-size: 0.875rem;