[BOARD] Remove Theengs Bridge self test (#2225)

Not needed for web or OTA update. It will enable to save flash

Co-authored-by: Florian <1technophile@users.noreply.github.com>

environments.ini

@@ -121,7 +121,7 @@ build_flags =
   '-DGATEWAY_MANUFACTURER="Theengs"'
   '-DGATEWAY_MODEL="TBRIDGE02"'
   ;'-DBOARD_HAS_PSRAM'
-  '-DSELF_TEST=true'
+  ;'-DSELF_TEST=true'
   ;'-mfix-esp32-psram-cache-issue'
 custom_description = BLE gateway with external antenna and Ethernet/WiFi connectivity, [user guide](https://tbridge02.theengs.io/)
 custom_hardware = Theengs Bridge gateway ethernet