fix: match topic avatar with category avatar sizing

templates/partials/topic/post.tpl

@@ -1,7 +1,7 @@
 <div class="clearfix post-header">
 	<div class="icon pull-left">
 		<a href="<!-- IF posts.user.userslug -->{config.relative_path}/user/{posts.user.userslug}<!-- ELSE -->#<!-- ENDIF posts.user.userslug -->">
-			{buildAvatar(posts.user, "sm2x", true, "", "user/picture")}
+			{buildAvatar(posts.user, "46", true, "", "user/picture")}
 			<i component="user/status" class="fa fa-circle status {posts.user.status}" title="[[global:{posts.user.status}]]"></i>
 		</a>
 	</div>