protobuf updates

app/src/main/proto/mesh.proto

@@ -58,12 +58,11 @@ message Position {
     double latitude = 1;
     double longitude = 2;
     int32 altitude = 3;
-    int32 battery_level = 4; // 0-100
-
-    /// true if this position came from the GPS inside the esp32 board, false if it was from a helper app on the phone
-    bool from_hardware = 5;
+    int32 battery_level = 4; // 1-100 (0 means not provided)
 
     /// This is usually not sent over the mesh (to save space), but it is sent from the phone so that the local device can set its RTC
+    /// If it is sent over the mesh (because there are devices on the mesh without GPS), it will only be sent by devices which has a
+    /// hardware GPS clock.
     uint32 time = 6; // seconds since 1970
 }