fix: Save changes to the startup model when InteractiveOtpMain starts up.

This is a regression. The bug was introduced when the controller was added. The
startUpView is saved if the user start OTP, while the controller models are saved
if changed.

Author: t2gran

src/ext/java/org/opentripplanner/ext/interactivelauncher/InteractiveOtpMain.java

@@ -31,6 +31,7 @@ private void run() {
   }
 
   private void startOtp() {
+    model.save();
     startDebugControllerAndSetupRequestInterceptor();
 
     System.out.println("Start OTP: " + model + "\n");

src/ext/java/org/opentripplanner/ext/interactivelauncher/Model.java

@@ -55,7 +55,7 @@ private static Model readFromFile() {
     }
   }
 
-  private void save() {
+  void save() {
     try {
       var mapper = new ObjectMapper().configure(SerializationFeature.INDENT_OUTPUT, true);
       mapper.writeValue(MODEL_FILE, this);