Only save the changed parts of config to disk.

src/mesh/MeshService.h

@@ -66,7 +66,7 @@ class MeshService
     /** The radioConfig object just changed, call this to force the hw to change to the new settings
      * @return true if client devices should be sent a new set of radio configs
      */
-    bool reloadConfig();
+    bool reloadConfig(int saveWhat=SEGMENT_CONFIG | SEGMENT_MODULECONFIG | SEGMENT_DEVICESTATE | SEGMENT_CHANNELS);
 
     /// The owner User record just got updated, update our node DB and broadcast the info into the mesh
     void reloadOwner();