Clean up launched VDM custom home flag

Launched in Android 15.

No CTS logic was ever based on the flag being off, so no
need to CP this.

#codehealth

Bug: 292214444
Bug: 379646558
Fix: 299402284
Test: presubmit
Flag: EXEMPT cleanup
Change-Id: Idc489d513238df92b636ba19d9123d13dadc1964