clean up extension tips css

src/vs/workbench/parts/extensions/electron-browser/media/extensions.css

@@ -143,16 +143,15 @@
 }
 
 .monaco-shell .extensions-suggestions {
-	display: none;
 	padding: 0 5px 0 5px;
 	-webkit-transition: visibility 250ms cubic-bezier(0.175, 0.885, 0.32, 1.275);
 	transition: visibility 250ms cubic-bezier(0.175, 0.885, 0.32, 1.275);
 }
 
-.monaco-shell .extensions-suggestions:not(.disabled) {
-	background-color: rgba(76, 119, 76, 0.9);
-}
-
 .monaco-shell .extensions-suggestions > .octicon {
 	font-size: 14px;
 }
+
+.monaco-shell .extensions-suggestions.disabled {
+	display: none;
+}
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