Clear position on GPS deactivation, unless using fixed position (#7464)

* Clear position on GPS deactivation, unless using fixed position

As reported by @dreimal8 , and confirmed by @tuxmobil , when using
and then subsequently disabling GPS the last position retrieved from
the GPS was stored and continued to be broadcast.

This change introduces a check to see if we are transitioning from
GPS Enabled to GPS Disabled or Not Present. If we are, and fixed
position is not in use, then we clear the local position.

This will prevent inaccurate and undesired position broadcasts for those
who disable their GPS.

Fixes https://github.com/meshtastic/firmware/issues/7228

* Update triple click to also clear position

---------

Co-authored-by: Ben Meadors <benmmeadors@gmail.com>

src/modules/AdminModule.cpp

@@ -638,7 +638,16 @@ void AdminModule::handleSetConfig(const meshtastic_Config &c)
     case meshtastic_Config_position_tag:
         LOG_INFO("Set config: Position");
         config.has_position = true;
+        // If we have turned off the GPS (disabled or not present) and we're not using fixed position,
+        // clear the stored position since it may not get updated
+        if (config.position.gps_mode == meshtastic_Config_PositionConfig_GpsMode_ENABLED &&
+            c.payload_variant.position.gps_mode != meshtastic_Config_PositionConfig_GpsMode_ENABLED &&
+            config.position.fixed_position == false && c.payload_variant.position.fixed_position == false) {
+            nodeDB->clearLocalPosition();
+            saveChanges(SEGMENT_NODEDATABASE | SEGMENT_CONFIG, false);
+        }
         config.position = c.payload_variant.position;
+
         // Save nodedb as well in case we got a fixed position packet
         break;
     case meshtastic_Config_power_tag: