fix: toPid link not working on subfolder installs

Was missing relative_path argument

Closes nodebb/nodebb#6948

templates/partials/topic/post.tpl

@@ -30,7 +30,7 @@
 			<small data-editor="{posts.editor.userslug}" component="post/editor" class="hidden">[[global:last_edited_by, {posts.editor.username}]] <span class="timeago" title="{posts.editedISO}"></span></small>
 
 			<!-- IF posts.toPid -->
-			<a component="post/parent" class="btn btn-xs btn-default hidden-xs" data-topid="{posts.toPid}" href="/post/{posts.toPid}"><i class="fa fa-reply"></i> @<!-- IF posts.parent.username -->{posts.parent.username}<!-- ELSE -->[[global:guest]]<!-- ENDIF posts.parent.username --></a>
+			<a component="post/parent" class="btn btn-xs btn-default hidden-xs" data-topid="{posts.toPid}" href="{config.relative_path}/post/{posts.toPid}"><i class="fa fa-reply"></i> @<!-- IF posts.parent.username -->{posts.parent.username}<!-- ELSE -->[[global:guest]]<!-- ENDIF posts.parent.username --></a>
 			<!-- ENDIF posts.toPid -->
 
 			<span>