[styles] Ensuring correct rendering height of search button in Safari

Overriding weird UA styles to ensure maximum click interaction area on
search button in no-JS and JS environment.

Bug: T272089
Change-Id: I8600402e022c041da29b31bf828198843c2ad7c6

resources/skins.vector.styles/SearchBox.less

@@ -75,6 +75,8 @@
 	right: @border-width-base;
 	min-width: @min-width-search-button;
 	width: @width-search-button;
+	// Support macOS Safari 14-: Remove `margin` weirdly set in user-agent stylesheet.
+	margin: 0;
 	border: 0;
 	padding: 0;
 	cursor: pointer;