code smell fixes (EXPOSURAPP-3058) (#1330)

* code smell fix for SubmissionQRCodeScanFragment.kt

* code smell fix for RetrieveDiagnosisKeysTransaction.kt

* code smell fix for GoogleAPIVersion.kt

* code smell fix for GoogleAPIVersion.kt

* Update RetrieveDiagnosisKeysTransaction.kt

* Update GoogleAPIVersion.kt

* Update DownloadInfo.kt

* simplified logic

* Revert "simplified logic"

This reverts commit a419e5bae7355e0d2adab66516df939dced7dc41.

* simplified logic

Co-authored-by: Ralf Gehrer <ralfgehrer@users.noreply.github.com>