[TIMOB-26548] Android: Unable to specify x86 as an abi in tiapp for production builds

Description

As raised in AC-5980, it's not possible to specify x86 as an abi to produce during a production build. The build errors with the below. This is because of bad logic [here](https://github.com/appcelerator/titanium_mobile/blob/7_4_X/android/cli/commands/_build.js#L1270) where we always remove x86 from production builds. We should allow users to use it if they want.

[ERROR] Invalid ABI "x86"

Valid ABIs:
   arm64-v8a
   armeabi-v7a

Steps to reproduce

1. Add the below to the android section of your tiapp

	<abi>armeabi-v7a,arm64-v8a,x86</abi>

2. Build for dist-playstore

Actual

Build errors with the above

Expected

Build should not error, x86 should be allowed if a user wants it