Merge pull request #1301 from mkinney/nrf_factory_reset

try to reset values on nrf using nodeDB methods

src/mesh/NodeDB.cpp

@@ -97,6 +97,8 @@ bool NodeDB::resetRadioConfig()
         nvs_flash_erase();
 #endif
 #ifdef NRF52_SERIES
+        FS.rmdir_r("/prefs");
+
         Bluefruit.begin();
 
         DEBUG_MSG("Clearing bluetooth bonds!\n");
@@ -105,6 +107,7 @@ bool NodeDB::resetRadioConfig()
 
         Bluefruit.Periph.clearBonds();
         Bluefruit.Central.clearBonds();
+
 #endif
         didFactoryReset = true;
     }