feat(gps): Do not start gps if lora region is unset (#10386)

* Disable gps thread on startup if lora region is unset

There is little reason to waste battery on the gps if the data cannot
yet be used.

* fix goobered merge

Refactor GPS enabling logic and remove duplicate code.

* trunk

---------

Co-authored-by: Jonathan Bennett <jbennett@incomsystems.biz>

src/graphics/draw/MenuHandler.cpp

@@ -214,6 +214,11 @@ static void applyLoraRegion(meshtastic_Config_LoRaConfig_RegionCode region, bool
         snprintf(moduleConfig.mqtt.root, sizeof(moduleConfig.mqtt.root), "%s/%s", default_mqtt_root, myRegion->name);
         changes |= SEGMENT_MODULECONFIG;
     }
+#if !MESHTASTIC_EXCLUDE_GPS
+    // Enable gps if it was previously disabled due to region not being set
+    if (gps != nullptr && !gps->isEnabled() && config.position.gps_mode == meshtastic_Config_PositionConfig_GpsMode_ENABLED)
+        gps->enable();
+#endif
     service->reloadConfig(changes);
 }