Fix autofocus behavior (#34397)

The "autofocus" was abused or misbehaved:

1. When users visit a page but they are not going to change a field,
then the field shouldn't get "autofocus"
* the "auth" / "user" page: in most cases, users do not want to change
the names
    * see also the GitHub's "settings" page behavior.
2. There shouldn't be duplicate "autofocus" inputs in most cases, only
the first one focuses
3. When a panel is shown, the "autofocus" should get focus
    * "add ssh key" panel

This PR fixes all these problems and by the way remove duplicate
"isElemHidden" function.

templates/repo/settings/options.tmpl

@@ -10,7 +10,7 @@
 				<input type="hidden" name="action" value="update">
 				<div class="required field {{if .Err_RepoName}}error{{end}}">
 					<label>{{ctx.Locale.Tr "repo.repo_name"}}</label>
-					<input name="repo_name" value="{{.Repository.Name}}" data-repo-name="{{.Repository.Name}}" autofocus required>
+					<input name="repo_name" value="{{.Repository.Name}}" data-repo-name="{{.Repository.Name}}" required>
 				</div>
 				<div class="inline field">
 					<label>{{ctx.Locale.Tr "repo.repo_size"}}</label>