tdf#91720 -after MailMerge print, plain std print is not possible

Reset the batchmode variable, after the batch print job
Related: 138d29aa

Change-Id: I6d8861e53ba6245019213d88d83603bfe932f010

vcl/unx/generic/printer/cupsmgr.cxx

@@ -663,6 +663,7 @@ bool CUPSManager::supportsBatchPrint() const
 bool CUPSManager::flushBatchPrint()
 {
     osl::MutexGuard aGuard( m_aCUPSMutex );
+    batchMode = false;                 // reset the batch print mode
     return processPendingJobs();
 }