[Tooling] Fix download of Wear Universal APK

[AliSoftware]

Description

Fix issue when the creation of the GitHub Release for the Wear app tries to download the Universal APK from Google Play

We initially tried to fix that in #11786 but we missed a Ruby syntax subtlety that made a our fix not work as expected and always return an offset of 0

See: #11786 (comment)

Testing information

• Change the lane from private_lane to lane
• Comment out the call to create_release
• Call bundle exec fastlane create_gh_release app:WooCommerce-Wear version:19.3
• Check that the downloaded APK is the one from the Wear App, with a versionCode > 50000 and not the one for the Mobile app

Disclamer: I didn't test the fix myself (as I wrote the PR from my iPad) Tested this morning and it works.

[dangermattic]

	1 Warning
⚠️	This PR is assigned to the milestone 19.3 ❄️. The due date for this milestone has already passed. Please assign it to a milestone with a later deadline or check whether the release for this milestone has already been finished.

Generated by 🚫 Danger

[wpmobilebot]

📲 You can test the changes from this Pull Request in WooCommerce-Wear Android by scanning the QR code below to install the corresponding build.

	App Name	WooCommerce-Wear Android
	Platform	⌚️ Wear OS
	Flavor	Jalapeno
	Build Type	Debug
	Commit	3bd8c20
	Direct Download	woocommerce-wear-prototype-build-pr11854-3bd8c20.apk

[wpmobilebot]

📲 You can test the changes from this Pull Request in WooCommerce Android by scanning the QR code below to install the corresponding build.

	App Name	WooCommerce Android
	Platform	📱 Mobile
	Flavor	Jalapeno
	Build Type	Debug
	Commit	3bd8c20
	Direct Download	woocommerce-prototype-build-pr11854-3bd8c20.apk

[AliSoftware]

Just ran the testing instructions this morning and confirmed via $ANDROID_SDK_ROOT/build-tools/34.0.0/aapt2 dump badging artifacts/WooCommerce-Wear-19.3-universal.apk that the downloaded APK when passing app:WooCommerce-Wear was the one for Wear indeed (versionCode='50567' versionName='19.3-rc-1w', uses-library:'com.google.android.wearable', …) 👍