[Android] File source deactivate should be called before callbacks

[BharathMG]

When getStatus() and delete() calls are made one after other, this can lead into crash described in #12382. This PR fixes callbacks to be called only after deactivating file source.

[tobrun]

@BharathMG thank you for the contribution! Due to github issues from yesterday, CI wasn't able to run for this PR. Can you repush your code so CI can execute?

[BharathMG]

@tobrun I pushed again and looks like CI is failing because of some dependency issues?

FAILURE: Build failed with an exception.

* What went wrong:
Could not resolve all files for configuration ':MapboxGLAndroidSDK:releaseCompileClasspath'.
> Could not find support-vector-drawable.aar (com.android.support:support-vector-drawable:27.1.1).
  Searched in the following locations:
      https://jcenter.bintray.com/com/android/support/support-vector-drawable/27.1.1/support-vector-drawable-27.1.1.aar
> Could not find livedata-core.aar (android.arch.lifecycle:livedata-core:1.1.0).
  Searched in the following locations:
      https://jcenter.bintray.com/android/arch/lifecycle/livedata-core/1.1.0/livedata-core-1.1.0.aar
> Could not find runtime.aar (android.arch.core:runtime:1.1.0).
  Searched in the following locations:
      https://jcenter.bintray.com/android/arch/core/runtime/1.1.0/runtime-1.1.0.aar
> Could not find viewmodel.aar (android.arch.lifecycle:viewmodel:1.1.0).
  Searched in the following locations:
      https://jcenter.bintray.com/android/arch/lifecycle/viewmodel/1.1.0/viewmodel-1.1.0.aar

[tobrun]

@BharathMG it seems so, even if that was resolved we would still hit #13167. I will cherry-pick your commit and follow up on that PR separately so you are further unblocked. Thanks again for this contribution!

[tobrun]

following up on this PR in #13168.