android: add setting to enable debug logs

If enabled, we log to stderr, which can get inspected via logcat.
Not user-friendly at all - but previously there was no way to get logs from a release build.

closes https://github.com/spesmilo/electrum/issues/7409

run_electrum

@@ -325,7 +325,6 @@ def main():
         import importlib.util
         android_gui = 'kivy' if importlib.util.find_spec('kivy') else 'qml'
         config_options = {
-            'verbosity': '*' if util.is_android_debug_apk() else '',
             'cmd': 'gui',
             'gui': android_gui,
             'single_password':True,