[ui] Change icon type for review action in action page (#11191)

* as title, do same changs on action view with #10737
* chage default icon from "invalid type" to "question" , because  "invalid type" is not a meaningfull icon type

Signed-off-by: a1012112796 <1012112796@qq.com>

modules/templates/helper.go

@@ -564,11 +564,11 @@ func ActionIcon(opType models.ActionType) string {
 	case models.ActionMirrorSyncPush, models.ActionMirrorSyncCreate, models.ActionMirrorSyncDelete:
 		return "repo-clone"
 	case models.ActionApprovePullRequest:
-		return "eye"
+		return "check"
 	case models.ActionRejectPullRequest:
-		return "x"
+		return "request-changes"
 	default:
-		return "invalid type"
+		return "question"
 	}
 }