The run in release command produces a debug .apk file

Introduced in master with https://github.com/NativeScript/nativescript-cli/pull/2883.

CLI version: `3.1.0-2017-06-16-9205`

Steps to reproduce:
- tns run android --release [keystore options]

Expected: a **-release.apk* in `platforms/android/build/outputs/apk/`.
Actual: a **-debug.apk* in `platforms/android/build/outputs/apk/`.