Test battery: run test_ammo_caliber.py too

The ammunition-swap suite from 1.20.0 was never listed in tests/run_all.py,
so it did not run with the release battery. It passes on its own (9 s).

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

Author: Zayn995

tests/run_all.py

@@ -33,6 +33,7 @@
     "test_zero_factors.py",
     "test_recoil_upgrades.py",
     "test_magazine_cascade.py",
+    "test_ammo_caliber.py",
     "test_upgrades.py",
     "test_alife_spawns.py",
     "test_v118_tweaks.py",