Add visual indicator to staff posts

Idea stolen from AB

sections/forums/thread.php

 <? 	} ?>
 		<col class="col_post_body" />
 	</colgroup>
-	<tr class="colhead_dark">
+	<tr class="colhead_dark<?=(Permissions::is_mod($AuthorID)) ? " staff_post" : ""?>">
 		<td colspan="<?=Users::has_avatars_enabled() ? 2 : 1?>">
 			<div style="float: left;"><a class="post_id" href="forums.php?action=viewthread&amp;threadid=<?=$ThreadID?>&amp;postid=<?=$PostID?>#post<?=$PostID?>">#<?=$PostID?></a>
 				<?=Users::format_username($AuthorID, true, true, true, true, true, $IsDonorForum);  echo "\n";?>

static/styles/beluga-oppai/style.css

 	border-bottom: 1px dashed #666;
 	font-weight: bold;
 }
+
+tbody .staff_post {
+	background: none;
+	background-color: #634852;
+}

static/styles/beluga/style.css

 	border-bottom: 1px dashed #666;
 	font-weight: bold;
 }
+
+tbody .staff_post {
+	background: none;
+	background-color: #634852;
+}

static/styles/oppai/style.css

 	border-bottom: 1px solid #BBB;
 	font-weight: bold;
 }
+
+.forum_post .staff_post {
+	background: #f1849a;
+}