fix: tag citra-mmj USA font for Latin America

apt.cpp:128-140 picks the shared font archive by GetRegionValue: CHN, KOR
and TWN get their own, every other CFG region gets 0x00014002. The CFG
region set has USA and no Latin America value, so the USA font serves the
Americas, which the repo writes [north-america, latin-america]. With
latin-america missing, --region br,cn kept only the Chinese archive.

tests/test_region.py

@@ -1411,5 +1411,32 @@ class MachineModelRomsCarryNoTerritory(unittest.TestCase):
         )
 
 
+class UsaRegionServesTheAmericas(unittest.TestCase):
+    """A code that knows a USA region and no Latin America one selects the
+    USA file there: Citra's shared font for CFG USA is 0x00014002
+    (apt.cpp:128-140), and a --region br,cn pack dropped it for the Chinese
+    archive alone."""
+
+    PROFILE = Path(__file__).resolve().parents[1] / "emulators" / "citra-mmj.yml"
+    FONT = (
+        "nand/00000000000000000000000000000000/title/0004009b/00014002/"
+        "content/00000000.app.romfs"
+    )
+
+    def test_brazil_ranks_the_default_shared_font(self):
+        import yaml
+
+        profile = yaml.safe_load(self.PROFILE.read_text(encoding="utf-8"))
+        index = region.build_region_index({"citra-mmj": profile})
+        requested = region.parse_requested("br,cn")
+        for destination, name in (
+            (self.FONT, "00000000.app.romfs"),
+            ("sysdata/cbf_std.bcfnt", "cbf_std.bcfnt"),
+        ):
+            with self.subTest(file=destination):
+                regions = region.lookup_regions(index, destination, name)
+                self.assertEqual(region.rank(regions, requested), 0)
+
+
 if __name__ == "__main__":
     unittest.main()