py,st3m: Move menu LED pattern setting back later in the boot process

Since !620 it happened much earlier, causing a lot of flickering at boot,
especially with plenty of apps installed. Move it back to until after
the application bundles are already collected.

Note that it happens a bit later than before now, as bundle processing
itself happens later because of being moved into the menu class, but
the end result is arguably nicer than before, as there's no weird
delay between setting the LEDs and showing the menu anymore.

Fixes: 06983264 ("Split sunmenu into its own file")

python_payload/st3m/main_menu.py

@@ -134,3 +134,10 @@ class MainMenu(SunMenu):
         self._items = categories
         # # self._scroll_controller = ScrollController()
         # self._scroll_controller.set_item_count(len(categories))
+
+    def on_enter(self, vm):
+        super().on_enter(vm)
+        if self.vm.direction == ViewTransitionDirection.FORWARD:
+            led_patterns.set_menu_colors()
+            leds.set_slew_rate(20)
+            leds.update()

python_payload/st3m/run.py

@@ -9,7 +9,6 @@ from st3m.application import (
     setup_for_app,
 )
 from st3m import settings_menu as settings, logging, processors, wifi
-from st3m.ui import led_patterns
 import st3m.wifi
 import st3m.utils
 
@@ -171,10 +170,6 @@ def run_main() -> None:
     leds.set_rgb(0, 255, 0, 0)
     leds.update()
 
-    led_patterns.set_menu_colors()
-    leds.set_slew_rate(20)
-    leds.update()
-
     try:
         network.hostname(
             settings.str_hostname.value if settings.str_hostname.value else "flow3r"