fix: the US Mega-CD BIOS also serves Latin America

jgenesis picks it for GenesisRegion::Americas, md-emu for boot byte 0x7a, ares for an NTSC-U disc: one code for every disc of the Americas, Brazilian Tec Toy releases included. The three tagged it north-america alone, so --region brazil dropped the BIOS those discs need. genesis_plus_gx and picodrive already carried both.

emulators/ares.yml

@@ -170,7 +170,7 @@ files:
   # Also used by Mega CD 32X (desktop-ui/emulator/mega-cd-32x.cpp)
   - name: SegaCDBIOS9303.bin
     system: mega-cd
-    region: [north-america]
+    region: [north-america, latin-america]
     required: true
     sha256: "fb477cdbf94c84424c2feca4fe40656d85393fe7b7b401911b45ad2eb991258c"
     validation: [sha256]

emulators/jgenesis.yml

@@ -77,7 +77,7 @@ files:
   - name: "bios_CD_U.bin"
     system: sega-megacd
     description: "Sega CD BIOS (US)"
-    region: [north-america]
+    region: [north-america, latin-america]
     required: true
     size: 131072
     validation: [size]

emulators/md-emu.yml

@@ -94,7 +94,7 @@ notes: |
 files:
   - name: bios_CD_U.bin
     system: sega-megacd
-    region: [north-america]
+    region: [north-america, latin-america]
     required: true
     agnostic: true
     size: 131072