Revert "audio_config: Push submenus onto the view stack"

This reverts commit 6df6c9a0.

Commit breaks changing of values.

python_payload/apps/audio_config/__init__.py

 from st3m.application import Application
-from st3m.ui.view import View, ViewTransitionDirection
 import math, random, sys_display
 from st3m import settings
 import audio
@@ -272,8 +271,10 @@ class Drawable:
 class Submenu(Drawable):
     def __init__(self, press):
         super().__init__(press)
+        self.submenu_active = False
 
     def draw(self, ctx):
+        if self.submenu_active:
             self._draw(ctx)
 
     def _draw(self, ctx):
@@ -564,18 +565,6 @@ class Press:
         self.select_pressed = False
 
 
-class SubView(View):
-    def __init__(self, menu, app):
-        self.menu = menu
-        self.app = app
-
-    def think(self, ins, delta_ms):
-        self.app.think(ins, delta_ms)
-
-    def draw(self, ctx):
-        self.menu.draw(ctx)
-
-
 class App(Application):
     def __init__(self, app_ctx):
         super().__init__(app_ctx)
@@ -607,6 +596,13 @@ class App(Application):
     def draw(self, ctx):
         self.ctx = ctx
 
+        main_menu_active = True
+        for menu in self.menus:
+            menu.draw(self.ctx)
+            if menu.submenu_active:
+                main_menu_active = False
+
+        if main_menu_active:
             self.draw_bg()
             ctx.save()
             ctx.rgb(*colours.GO_GREEN)
@@ -655,12 +651,12 @@ class App(Application):
         super().think(ins, delta_ms)
         for i in range(1, 10, 2):
             if self.input.captouch.petals[i].whole.pressed:
-                if not self.is_active():
-                    self.vm.pop()
+                for menu in self.menus:
+                    menu.submenu_active = False
                 if i < 5:
-                    self.vm.push(SubView(self.menus[i // 2], self))
+                    self.menus[i // 2].submenu_active = True
                 elif i > 5:
-                    self.vm.push(SubView(self.menus[(i // 2) - 1], self))
+                    self.menus[(i // 2) - 1].submenu_active = True
 
         if (
             self.input.buttons.app.right.pressed
@@ -674,12 +670,11 @@ class App(Application):
 
     def on_enter(self, vm):
         super().on_enter(vm)
-        if self.vm.direction == ViewTransitionDirection.FORWARD:
         settings.load_all()
 
     def on_exit(self):
-        if self.vm.direction == ViewTransitionDirection.BACKWARD:
         settings.save_all()
+        super().on_exit()
 
 
 if __name__ == "__main__":