Allow attachment by CryptoManager during restore.

This fixes failed tests bugs\core_4524_test.py and bugs\core_6071_test.py due to new check introduced in a0e23c3 (Implement #6413)

Author: hvlad

src/jrd/CryptoManager.cpp

@@ -1038,6 +1038,7 @@ namespace Jrd {
 				ClumpletWriter writer(ClumpletReader::dpbList, MAX_DPB_SIZE);
 				writer.insertString(isc_dpb_user_name, DBA_USER_NAME);
 				writer.insertByte(isc_dpb_no_db_triggers, TRUE);
+				writer.insertInt(isc_dpb_worker_attach, 1);
 
 				// Avoid races with release_attachment() in jrd.cpp
 				XThreadEnsureUnlock releaseGuard(dbb.dbb_thread_mutex, FB_FUNCTION);