USSD: Fix alert dialog theme

We have light theme by default, but google uses dark theme
example:
https://github.com/nitrogen-project/android_frameworks_base/blob/27a4500227bd5fb42f6c67e5b1be6307ea2ae19b/core/java/android/app/AlertDialog.java#L215

Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
1 file changed