bundler: Remove unneeded print

* If the command didn't execute succesfully then it would've
  returned with exit(1) and caused the build to stop
* Hence there's no need to inform the user about it
  since in the soong build-box it's automatically removed
  once the client has finished running
  ( Successfully bundled 2 bfbs files into filename:out/soong/.temp/sbox331472943/module_schema_data )

Test: m
Change-Id: I5b3211e87673bdf0f40e0dcca8e2f6a4a7304d14