added save function to write settings to fS

src/EMSESPSettingsService.cpp

@@ -82,4 +82,8 @@ void EMSESPSettingsService::begin() {
     _fsPersistence.readFromFS();
 }
 
+void EMSESPSettingsService::save() {
+    _fsPersistence.writeToFS();
+}
+
 } // namespace emsesp

src/EMSESPSettingsService.h

@@ -62,6 +62,7 @@ class EMSESPSettingsService : public StatefulService<EMSESPSettings> {
     EMSESPSettingsService(AsyncWebServer * server, FS * fs, SecurityManager * securityManager);
 
     void begin();
+    void save();
 
   private:
     HttpEndpoint<EMSESPSettings>  _httpEndpoint;