Android: replace deprecated StatFs functions

[ath0mas]

Platforms affected

Android

Motivation and Context

getAvailableBlocks and getBlockSize are deprecated since API 18

Description

getAvailableBytes is available since API 18
while current cordova-android must be >=12.0.0, so minSdk 24

Testing

Checklist

• I've run the tests to see all new and existing tests pass
• I added automated test coverage as appropriate for this change
• Commit is prefixed with (platform) if this change only applies to one platform (e.g. (android))
• If this Pull Request resolves an issue, I linked to the issue in the text above (and used the correct keyword to close issues using keywords)
• I've updated the documentation if necessary