Revert "item_store(): deduplicate by mid OR uuid"

This reverts commit 0d0ede7b14.

include/items.php

@@ -1930,9 +1930,8 @@ function item_store($arr, $allow_exec = false, $deliver = true) {
 	if($parent_deleted)
 		$arr['item_deleted'] = 1;
 
-	$r = q("SELECT id FROM item WHERE (mid = '%s' OR uuid = '%s') AND uid = %d and revision = %d LIMIT 1",
+	$r = q("SELECT id FROM item WHERE mid = '%s' AND uid = %d and revision = %d LIMIT 1",
 		dbesc($arr['mid']),
-		dbesc($arr['uuid']),
 		intval($arr['uid']),
 		intval($arr['revision'])
 	);