add FS macro guards

src/mesh/NodeDB.cpp

@@ -115,9 +115,11 @@ bool NodeDB::factoryReset()
     LOG_INFO("Performing factory reset!\n");
     // first, remove the "/prefs" (this removes most prefs)
     rmDir("/prefs");
+#ifdef FSCom
     if (FSCom.exists("/static/rangetest.csv") && !FSCom.remove("/static/rangetest.csv")) {
         LOG_WARN("Could not remove rangetest.csv file\n");
     }
+#endif
     // second, install default state (this will deal with the duplicate mac address issue)
     installDefaultDeviceState();
     installDefaultConfig();