widadjust: Fix rest of warnings.

apps/widadjust/widadjust.app.js

@@ -219,9 +219,6 @@ var cancel_gps = 0;
 function on_gps(fix) {
   // Do this first so that we don't get extra jitter
   let now = getTime();
-  let have = false, lat = "lat ", alt = "?",
-      speed = "speed ", hdop = "?", adelta = "adelta ",
-      tdelta = "tdelta ";
 
   if (cancel_gps)
     return;
@@ -244,11 +241,6 @@ function on_gps(fix) {
     .drawString(msg, 3, 25);
 }
 
-function stopGps() {
-  cancel_gps=true;
-  gps.stop_gps();
-}
-
 fmt.init();
 gps.init();
 gps.start_gps();