Fix button alignments and remove unnecessary styles (#34206)

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

templates/shared/actions/runner_list.tmpl

@@ -16,7 +16,7 @@
 					<div class="header">
 						Registration Token
 					</div>
-					<div class="ui input">
+					<div class="ui action input">
 						<input type="text" value="{{.RegistrationToken}}" readonly>
 						<button class="ui basic label button" aria-label="{{ctx.Locale.Tr "copy"}}" data-clipboard-text="{{.RegistrationToken}}">
 							{{svg "octicon-copy" 14}}