Fix issue comment form and quick-submit (#30623)

1. Rewrite initGlobalEnterQuickSubmit (by the way, remove jQuery)
2. Fix issue comment form layout

templates/devtest/fetch-action.tmpl

@@ -21,7 +21,7 @@
 				<button name="btn">submit get</button>
 			</form>
 			<form method="post" action="fetch-action-test?k=1" class="form-fetch-action">
-				<div><textarea name="text" rows="3" class="js-quick-submit"></textarea></div>
+				<div><textarea name="text" rows="3"></textarea></div>
 				<div><label><input name="check" type="checkbox"> check</label></div>
 				<div><button name="btn">submit post</button></div>
 			</form>