Fix missing styling for dropdown icon on review button (#11998)

* Fix missing styling for dropdown icon on review button

* Remove unnecessary span element

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: Lauris BH <lauris@nix.lv>

templates/repo/diff/new_review.tmpl

@@ -1,6 +1,6 @@
 <div class="ui top right pointing dropdown custom" id="review-box">
 	<div class="ui tiny green button btn-review">
-		<span class="text">{{.i18n.Tr "repo.diff.review"}}</span>
+		{{.i18n.Tr "repo.diff.review"}}
 		<i class="dropdown icon"></i>
 	</div>
 	<div class="menu review-box">