Update inputs to use mw-ui styles

Replaces many of the styles with the new standard ones in mw-ui, which is
present in v1.22 of Mediawiki, the current lowest supported version of
ULS.

Might require a follow-up to reduce the amount of redundant CSS present

Bug: T52599
Change-Id: Id186ece6513f154e0388bc4170c21bdabb59038a

resources/css/ext.uls.inputsettings.css

@@ -12,7 +12,7 @@ div.input-settings-block {
 }
 
 .imelabel {
-	display: block;
+	display: inline;
 	padding-bottom: 10px;
 	font-size: 10pt;
 	line-height: 16pt;
@@ -22,10 +22,6 @@ div.input-settings-block {
 	padding-left: 5px;
 }
 
-.imelabel input {
-	float: left;
-}
-
 .uls-ime-menu-settings-item {
 	background-color: #f0f0f0;
 	border-radius: 0 0 5px 5px;