Change webhook-type in create-view (#29114)

It's now possible to change webhook-type in create-view.

before:

![image](https://github.com/go-gitea/gitea/assets/72873130/9ee1b9fb-843b-4f28-b8d6-6361e5d184f1)

after:

![image](https://github.com/go-gitea/gitea/assets/72873130/9dbf058f-5912-43af-9acd-487271212f2d)

---------

Co-authored-by: silverwind <me@silverwind.io>
Co-authored-by: Giteabot <teabot@gitea.io>

templates/shared/webhook/icon.tmpl

@@ -3,7 +3,7 @@
 	{{$size = .Size}}
 {{end}}
 {{if eq .HookType "gitea"}}
-	<img width="{{$size}}" height="{{$size}}" src="{{AssetUrlPrefix}}/img/gitea.svg">
+	{{svg "gitea-gitea" $size "img"}}
 {{else if eq .HookType "gogs"}}
 	<img width="{{$size}}" height="{{$size}}" src="{{AssetUrlPrefix}}/img/gogs.ico">
 {{else if eq .HookType "slack"}}