Correcting task failure ':compileDebugJavaWithJavac'

[eutiagomarques]

First, thank you very much for your excellent work in keeping Secure Storage active. We are using this plugin as a replacement for cordova-plugin's secure storage for an application that is currently in production and has been for some time now to support android 10 devices.

But I'm getting an error while running the android build:
"Execution failed for task ':compileDebugJavaWithJavac'"

I solved the issue by following the suggestion to change the error.
Declare 2 variables as Final.

The change in question is PR #48