GT Performance 1.0.3

Fixed

• The License screen's Activate, Deactivate, and Check buttons returned a blank page in the store build. Identical cause to the controls fixed in 1.0.2 - the handlers were still registered as admin_post_gtp_license_* while the buttons submitted gtperf_license_* - in a file the 1.0.2 sweep did not reach. The WordPress.org build has no licensing code and was never affected.
• AdminActionWiringTest now discovers every PHP file under src/ instead of checking a hardcoded list of four. The hardcoded list was the same mistake the test exists to catch: it could not see the licensing module, which only ships in the store build, so 1.0.2 shipped believing the wiring was fully verified.