syst3m mixer: exit properly

python_payload/st3m/ui/elements/overlays.py

@@ -417,6 +417,7 @@ class OverlaySystemMenu(Overlay):
                 self.latch = False
             elif self.sub is not None:
                 if not self.sub.override_os_button_back:
+                    self.sub.on_exit()
                     self.sub = None
             else:
                 self.close_menu()

python_payload/st3m/ui/help.py

@@ -57,3 +57,6 @@ class Help(Responder):
                 break
             ctx.move_to(self.x, self.y + offset)
             ctx.text(line)
+
+    def on_exit(self):
+        pass