[android] fix ReactRootView cast error happening on stripe sdk

[Kudo]

Why

when testing stripe sdk example "Card element only" test case, there is an exception from keyboard listener

         AndroidRuntime  D  Shutting down VM
                         E  FATAL EXCEPTION: main
                         E  Process: host.exp.exponent, PID: 8849
                         E  java.lang.ClassCastException: android.view.ContextThemeWrapper cannot be cast to android.app.Activity
                         E      at com.facebook.react.ReactRootView$CustomGlobalLayoutListener.checkForKeyboardEvents(ReactRootView.java:937)
                         E      at com.facebook.react.ReactRootView$CustomGlobalLayoutListener.onGlobalLayout(ReactRootView.java:913)
                         E      at android.view.ViewTreeObserver.dispatchOnGlobalLayout(ViewTreeObserver.java:1061)
                         E      at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:3352)
                         E      at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:2286)
                         E      at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:8948)
                         E      at android.view.Choreographer$CallbackRecord.run(Choreographer.java:1231)
                         E      at android.view.Choreographer$CallbackRecord.run(Choreographer.java:1239)
                         E      at android.view.Choreographer.doCallbacks(Choreographer.java:899)
                         E      at android.view.Choreographer.doFrame(Choreographer.java:832)
                         E      at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:1214)
                         E      at android.os.Handler.handleCallback(Handler.java:942)
                         E      at android.os.Handler.dispatchMessage(Handler.java:99)
                         E      at android.os.Looper.loopOnce(Looper.java:201)
                         E      at android.os.Looper.loop(Looper.java:288)
                         E      at android.app.ActivityThread.main(ActivityThread.java:7898)
                         E      at java.lang.reflect.Method.invoke(Native Method)
                         E      at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
                         E      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:936)

How

the getContext() is actually a ContextThemeWrapper for ExperienceActivity, we should not cast it to Activity directly. this pr tries to use getBaseContext() to unwrap it.

[aleqsio]

Awesome, thanks for your help!