fixed settings to gpsservice, not gps_service

apps/gpsservice/app.js

@@ -22,7 +22,7 @@ function showMainMenu() {
     '': { 'title': 'GPS Service' },
     '< Exit': ()=>{load();},
     'GPS': {
-      value: !!settings.service,
+      value: !!settings.gpsservice,
       format: v =>v?'On':'Off',
       onchange: v => {
         settings.gpsservice = v;

apps/gpsservice/settings.json

@@ -1 +1 @@
-{"gps_service":false, "power_mode":"Super-E", "update":120, "search":6}
+{"gpsservice":false, "power_mode":"SuperE", "update":120, "search":6}