App Lounge: handled declined purchase

Description

User will see an error dialog when a purchase is declined.

Issue(s)

• #e/backlog#292

Test environment

Gradle build against 292-purchase_declined branch,install the apk into the device

Test procedures

Technical details

Try to purchase an app -> make a declined purchase -> user should show an error dialog

Screenshots

Check list

• Self review
• Test procedure explained
• Tested on fresh install
• Tested applied as an update
• License
• Internal documentation
• User documentation