Update platformio_override.sample.ini

Remove the buildflag for the usermod, as it is not longer needed

platformio_override.sample.ini

@@ -533,7 +533,7 @@ monitor_filters = esp32_exception_decoder
 # 433MHz RF remote example for esp32dev
 [env:esp32dev_usermod_RF433]
 extends = env:esp32dev
-build_flags = ${env:esp32dev.build_flags} -D USERMOD_RF433
+build_flags = ${env:esp32dev.build_flags}
 custom_usermods = usermod_v2_RF433
 lib_deps = ${env:esp32dev.lib_deps}
   sui77/rc-switch @ 2.6.4