fix(MainDb): ConferenceInfoNoDeviceFilter must be equals to a 2-power

src/db/main-db.h

@@ -51,7 +51,7 @@ public:
 		ConferenceCallFilter = 0x1,
 		ConferenceChatMessageFilter = 0x2,
 		ConferenceInfoFilter = 0x4,
-		ConferenceInfoNoDeviceFilter = 0x6
+		ConferenceInfoNoDeviceFilter = 0x8
 	};
 
 	typedef EnumMask<Filter> FilterMask;