Increate the max width of action widgets to 80% of the browser width (microsoft#186157)

Author: a-stewart

src/vs/platform/actionWidget/browser/actionWidget.css

@@ -7,7 +7,7 @@
 	font-size: 13px;
 	border-radius: 0;
 	min-width: 160px;
-	max-width: 500px;
+	max-width: 80vw;
 	z-index: 40;
 	display: block;
 	width: 100%;