Fix TNC settings not being saved, courtesy of @attermann

Utilities.h

@@ -1260,11 +1260,9 @@ void eeprom_update(int mapped_addr, uint8_t byte) {
         }
         written_bytes++;
         
-        if ((mapped_addr - eeprom_addr(0)) == ADDR_INFO_LOCK) {
+        if (((mapped_addr - eeprom_addr(0)) == ADDR_INFO_LOCK) || (mapped_addr - eeprom_addr(0)) == ADDR_CONF_OK) {
-            #if !HAS_EEPROM && MCU_VARIANT == MCU_NRF52
                 // have to do a flush because we're only writing 1 byte and it syncs after 4
                 eeprom_flush();
-            #endif
         }
 
         if (written_bytes >= 4) {