displaysettings,inputsettings: Rename two classes for consistency

I suspect these may have been accidentally mixed up or miscompleted
from a nearly data-attribute or interface message, since all other
classes start with `.uls-` in this repository.

* "uls-input-settings-imes" is not used referenced anywhere else.

* "uls-sub-panel" is referenced in one skinStyles override, updated with
  https://github.com/StarCitizenTools/mediawiki-skins-Citizen/pull/434.

Change-Id: Ia0b23d795f7807ef9227f66d0890a25524cd5a9f

resources/css/ext.uls.displaysettings.less

@@ -12,7 +12,7 @@
 	z-index: 1;
 }
 
-.ext-uls-sub-panel {
+.uls-sub-panel {
 	border-top: 1px solid #eaecf0;
 	padding-top: 25px;
 	top: -20px;

resources/css/ext.uls.inputsettings.less

@@ -50,7 +50,7 @@
 	color: #000;
 }
 
-.ext-uls-input-settings-imes-title:empty {
+.uls-input-settings-imes-title:empty {
 	display: none;
 }