[Screen share] Point new string resource name to old string resource.

CTS tests rely on the string resources
`screen_share_permission_dialog_option_entire_screen` and
`screen_share_permission_dialog_option_single_app` existing so that the
tests can find the right UI elements.

The 24Q3 & 24Q4 builds need to pass the 24Q3 CTS tests, which means we
can't use the new resource name in the CTS tests because the 24Q3 build
would fail since it doesn't have the new reousrce name.

This CL creates an alias from the new resource to the old resource in
SysUI. This lets the SysUI code to keep using the new resource name, and
lets the CTS tests to keep using the old resource name.

Fixes: 353136848
Bug: 352327853
Flag: EXEMPT test only
Test: atest
CtsStatsdAtomHostTestCases:android.cts.statsdatom.media.projection.MediaProjectionAtomsTests
the 24Q4 build on the 24Q3 CTS tests

Change-Id: I6e866e9bb930b89992f6231cae8bd6f75b25602c