Fix issue filters on mobile view (#25368)

Fix #24846 applying the solution proposed by @silverwind 

<details>
<summary>Screenshots</summary>


![Bildschirmfoto vom 2023-06-19
12-20-54](https://github.com/go-gitea/gitea/assets/47871822/3f4e4536-38c4-451b-bfc0-a7c39acd37f0)
![Bildschirmfoto vom 2023-06-19
12-21-02](https://github.com/go-gitea/gitea/assets/47871822/3403ecc2-4d7f-4acd-b0c0-1b7a10228ff7)
![Bildschirmfoto vom 2023-06-19
12-21-16](https://github.com/go-gitea/gitea/assets/47871822/ef28a2bf-b7cc-4aec-b54b-99d2cc46a1f6)
![Bildschirmfoto vom 2023-06-19
12-21-21](https://github.com/go-gitea/gitea/assets/47871822/f8cd72a5-379e-410b-b0ef-d58895719370)
![Bildschirmfoto vom 2023-06-19
12-21-28](https://github.com/go-gitea/gitea/assets/47871822/34c78301-820c-4106-a086-ae81dc97eb91)
![Bildschirmfoto vom 2023-06-19
12-21-48](https://github.com/go-gitea/gitea/assets/47871822/b677adf1-3a48-42c8-befe-fa9d2679f0a3)
</details>



Replaces #25335

templates/repo/issue/list.tmpl

@@ -89,7 +89,7 @@
 				{{template "repo/issue/openclose" .}}
 			</div>
 			<div class="issue-list-toolbar-right">
-				<div class="ui secondary filter stackable menu labels">
+				<div class="ui secondary filter menu labels">
 					<!-- Label -->
 					<div class="ui {{if not .Labels}}disabled{{end}} dropdown jump item label-filter">
 						<span class="text">
@@ -278,7 +278,7 @@
 				{{template "repo/issue/openclose" .}}
 			</div>
 			<div class="issue-list-toolbar-right">
-				<div class="ui secondary filter stackable menu">
+				<div class="ui secondary filter menu">
 					{{if not .Repository.IsArchived}}
 					<!-- Action Button -->
 					{{if .IsShowClosed}}