fix: small QoL: return to the last selected menu location (#1629)

## Summary

* **What is the goal of this PR?** Small UX improvement to the Home
screen by preserving the last selected cursor position when returning to
it.

It supersedes #985 and #1103, which are both significantly outdated and
hundreds of commits behind master.

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### AI Usage

Did you use AI tools to help write this code? _**< YES >**_

src/activities/settings/OpdsServerListActivity.cpp

@@ -34,7 +34,7 @@ void OpdsServerListActivity::onExit() { Activity::onExit(); }
 void OpdsServerListActivity::loop() {
   if (mappedInput.wasPressed(MappedInputManager::Button::Back)) {
     if (pickerMode) {
-      activityManager.goHome();
+      activityManager.goHome(HomeMenuItem::OPDS_BROWSER);
     } else {
       finish();
     }