fix: drop region tags chosen by machine model

XRoar reads the Dragon 200-E and Alice ROMs for those machine configs
(src/xroar.c:437-444, 552-558 at 1.12.1), and VICE the Japanese kernal
and chargen for the C64 JAP and VIC-1001 models: a (Japan) file name
selects the NTSC model (libretro-core.c:2018-2034). No code branches on a
territory for these files, so region: is removed, as profiling.md rules
for a model enum.

tests/test_region.py

@@ -1384,5 +1384,32 @@ class YmirLibretroRegions(unittest.TestCase):
                              if e["name"] == "sega_101.bin"))
 
 
+class MachineModelRomsCarryNoTerritory(unittest.TestCase):
+    """XRoar reads d200e_1.rom for the dragon200e machine and alice.rom for
+    the alice machine (src/xroar.c:437-444, 552-558), and VICE the Japanese
+    kernal and chargen for the C64 JAP and VIC-1001 models, which a file name
+    tagged (Japan) never selects (libretro-core.c:2018-2034 sets NTSC). The
+    site told a Spanish Dragon 64 owner to start with d200e_1.rom."""
+
+    CASES = {
+        "xroar": ("d200e_1.rom", "d200e_2.rom", "d200e_26.rom", "alice.rom"),
+        "x64sdl": ("jpkernal", "jpchrgen"),
+        "vice_xvic": ("kernal.901486-02.bin", "chargen-901460-02.bin"),
+    }
+
+    def test_model_roms_are_unregioned(self):
+        profiles = common.load_emulator_profiles(
+            os.path.join(os.path.dirname(__file__), "..", "emulators")
+        )
+        for profile, names in self.CASES.items():
+            for entry in profiles[profile]["files"]:
+                if entry["name"] in names:
+                    with self.subTest(profile=profile, name=entry["name"]):
+                        self.assertNotIn("region", entry)
+        self.assertFalse(
+            [e["name"] for e in profiles["c64-emu"]["files"] if e.get("region")]
+        )
+
+
 if __name__ == "__main__":
     unittest.main()