Remove no longer applicable proguard rule
Remove no longer applicable proguard rule

With the move to AGP 4.1.0, the `useuniqueclassmembernames` proguard rule no longer applies to r8.

eboudrant/net.ebt.muzei.miyazaki,eboudrant/net.ebt.muzei.miyazaki,eboudrant/net.ebt.muzei.miyazaki