bugfix deleting unknown tag / WIP locking

- bugfix: unable to delete unknown tag by right clicking
- work in progress: lock tag inventory, by rejecting new tags

ESP32_AP-Flasher/include/tag_db.h

@@ -69,6 +69,7 @@ struct Config {
     uint8_t stopsleep;
     uint8_t runStatus;
     uint8_t preview;
+    uint8_t lock;
     uint8_t wifiPower;
     char timeZone[52];
     uint8_t sleepTime1;