Remove MODULE_LICENSE_APACHE2 from Launcher3

Repositories containing third-party code need a METADATA and a
license_type. Repositories containing only first-party code no longer
need a MODULE_LICENSE_* file.

Bug: 68860345
Bug: 69058154
Bug: 151953481

Test: no code changes

Exempt-From-Owner-Approval: janitorial work

Change-Id: I17f3c230dbe730c03a2d8727e26c32b3e7e37e52