Improve list of signing keys

### Problem description

I have created just 3 keys so far in the Tabris (Android debug, android release and iOS Dev).
But in the drop down of Settings page, for both Debug and Release, so many keys are shown. I am now not sure which key i built with on my last release. Due to this my app is unable to upgrade (App not installed - error shown why i upgrade). But fresh install works, which is not what I intend to do in Production.

### Expected behavior

Not sure, in my app settings page i should see the one actual release key, so that I don't have this confusion.

### Environment
Cloud build.