Follow-up: Switch to AAPT2

[XRevan86]

As explained in https://github.com/Magisk-Modules-Alt-Repo/open_webview/issues/51#issuecomment-2558281854 mktemp doesn't work on all versions of Android as I previously expected.
It can be fixed with the use of the -p argument, but at this point it's better to just not use it.

Apologies for incomplete testing last time.