ci: revert nano_nora changes

Author: P-R-O-C-H-Y

boards.txt

@@ -42280,8 +42280,6 @@ nano_nora.upload.tool.network=esp_ota
 nano_nora.upload.protocol=serial
 nano_nora.upload.maximum_size=3145728
 nano_nora.upload.maximum_data_size=327680
-nano_nora.upload.flags=
-nano_nora.upload.extra_flags=
 nano_nora.upload.use_1200bps_touch=false
 nano_nora.upload.wait_for_upload_port=false