android: handle onDestroy (#6811)

* handle onDestroy

we need it if killed by the system (ie: battery optimizations or OOM)
we need it to exit the lua VM when we call finish() from Kotlin

This prevents us for being trapped into a zombie state

base

@@ -1 +1 @@
-Subproject commit 5f9e9b7eb39fc98cdacba52d081fe2b559fcfb33
+Subproject commit afdd59b2048bde27536bef07e754102840f63850

frontend/device/android/device.lua

@@ -134,6 +134,8 @@ function Device:init()
             logger.dbg("Android application event", ev.code)
             if ev.code == C.APP_CMD_SAVE_STATE then
                 return "SaveState"
+            elseif ev.code == C.APP_CMD_DESTROY then
+                UIManager:quit()
             elseif ev.code == C.APP_CMD_GAINED_FOCUS
                 or ev.code == C.APP_CMD_INIT_WINDOW
                 or ev.code == C.APP_CMD_WINDOW_REDRAW_NEEDED then