Fix search form button overlap (#11840)

Co-authored-by: techknowlogick <techknowlogick@gitea.io>

templates/repo/issue/search.tmpl

@@ -1,13 +1,11 @@
 <form class="ui form ignore-dirty">
-	<div class="ui fluid action input">
+	<div class="ui search fluid action input">
 		<input type="hidden" name="type" value="{{$.ViewType}}"/>
 		<input type="hidden" name="state" value="{{$.State}}"/>
 		<input type="hidden" name="labels" value="{{.SelectLabels}}"/>
 		<input type="hidden" name="milestone" value="{{$.MilestoneID}}"/>
 		<input type="hidden" name="assignee" value="{{$.AssigneeID}}"/>
-		<div class="ui search action input">
 		<input name="q" value="{{.Keyword}}" placeholder="{{.i18n.Tr "explore.search"}}..." autofocus>
 		<button class="ui blue button" type="submit">{{.i18n.Tr "explore.search"}}</button>
 	</div>
-	</div>
 </form>

templates/user/dashboard/issues.tmpl

@@ -67,16 +67,14 @@
 					</div>
 					<div class="column center aligned">
 						<form class="ui form ignore-dirty">
-							<div class="ui fluid action input">
+							<div class="ui search fluid action input">
 								<input type="hidden" name="type" value="{{$.ViewType}}"/>
 								<input type="hidden" name="repos" value="[{{range $.RepoIDs}}{{.}}%2C{{end}}]"/>
 								<input type="hidden" name="sort" value="{{$.SortType}}"/>
 								<input type="hidden" name="state" value="{{$.State}}"/>
-								<div class="ui search action input">
 								<input name="q" value="{{$.Keyword}}" placeholder="{{.i18n.Tr "explore.search"}}..." autofocus>
 								<button class="ui blue button" type="submit">{{.i18n.Tr "explore.search"}}</button>
 							</div>
-							</div>
 						</form>
 					</div>
 					<div class="column right aligned">