Use getLaunchedFromPackage instead of getCallingPackage

Ensure that MediaProjectionPermissionActivity is doing proper
attribution and validation of permissions before showing.

Bug: 373581993
Test: presubmit
Flag: com.android.systemui.media_projection_request_attribution_fix
Change-Id: Ibcc14090ce38a0fac21a394d861d044b9669a8a0