TBD BE: MET remove unneeded config keys in BE environments

Remove following keys from backend environments:

"GW_SCREEN_PRESETS_FILENAME"
"GW_FEATURE_MODULE_TAF"
"GW_FEATURE_MODULE_SIGMET"
"GW_FEATURE_MODULE_AIRMET"
"GW_FEATURE_MENU_SATCOMP"

For all local keys developers should do this on their own machine, by removing them from config.json