fix: update the SDK initialisation method

Fixes # (issue)

While working on this: https://github.com/rudderlabs/rudder-sdk-android/pull/408, I forgot to update the sample app with the latest changes. This PR attempts to fix that.

Type of change

[x] Bug fix (non-breaking change which fixes an issue)
[ ] New feature (non-breaking change which adds functionality)
[ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
[ ] This change requires a documentation update
Checklist:
[ ] Version upgraded (project, README, gradle, podspec etc)
[ ] My code follows the style guidelines of this project
[ ] I have performed a self-review of my own code
[ ] I have commented my code, particularly in hard-to-understand areas
[ ] I have added unit tests for the code
[ ] I have made corresponding changes to the documentation

rudderlabs / rudder-sdk-android

fix: update the SDK initialisation method #420

Type of change

Checklist:

Quality Gate passed