ZP-1279 Make changes per Manfred Kuntas. The "$this" is not required but

yes, it makes sense.  Also added requested debug-level log.
Released under the Affero GNU General Public License (AGPL) version 3.

src/backend/imap/imap.php

@@ -1543,8 +1543,8 @@ class BackendIMAP extends BackendDiff implements ISearchProvider {
 
         $folderImapid = $this->getImapIdFromFolderId($folderid);
         if (strcasecmp($folderImapid, $this->create_name_folder(IMAP_FOLDER_TRASH)) != 0) {
-            $s1 = MoveMessage($folderid, $id, $this->create_name_folder(IMAP_FOLDER_TRASH), $contentparameters);
-            return($s1);
+            ZLog::Write(LOGLEVEL_DEBUG, sprintf("BackendIMAP->Message_Moved_To_Trash('%s','%s')", $folderid, $id));
+            return($this->MoveMessage($folderid, $id, $this->create_name_folder(IMAP_FOLDER_TRASH), $contentparameters);
         }
         $this->imap_reopen_folder($folderImapid);