fix: read pcsx_rearmed us slot as the default

CheckCdrom sets PSX_REGION_US before it reads the licence, and only
"Inc." or "Euro pe" move it (libpcsxcore/misc.c:422-453). A Latin
American disc boots the US slot, so its four BIOS images carry
latin-america and --region br,jp keeps them.

emulators/pcsx_rearmed.yml

@@ -36,13 +36,13 @@ files:
 
   - name: "scph5501.bin"
     description: "SCPH-5501 (v3.0 11-18-96 A)"
-    region: [north-america]
+    region: [north-america, latin-america]
     size: 524288
     required: false
     hle_fallback: true
     validation: [size]
     source_ref: "source frontend/libretro.c:3864-3867 (listed_bios[1])"
-    note: "Preferred US BIOS, searched first by exact filename."
+    note: "Preferred US BIOS, searched first by exact filename. The US slot is the detector's default: a disc takes it for both America licence strings and for any licence that is neither \"Inc.\" (JP) nor \"Euro pe\" (EU), and content without a disc boots it too (libpcsxcore/misc.c:422-453, frontend/libretro.c:2167-2171)."
 
   # -- Region: Europe (PSX_REGION_EU = 2) --
 
@@ -70,7 +70,7 @@ files:
 
   - name: "scph101.bin"
     description: "SCPH-101 (v4.4 03-24-00 A) - PSone US"
-    region: [north-america]
+    region: [north-america, latin-america]
     size: 524288
     required: false
     hle_fallback: true
@@ -80,7 +80,7 @@ files:
 
   - name: "scph7001.bin"
     description: "SCPH-7001 (v4.1 12-16-97 A)"
-    region: [north-america]
+    region: [north-america, latin-america]
     size: 524288
     required: false
     hle_fallback: true
@@ -89,7 +89,7 @@ files:
 
   - name: "scph1001.bin"
     description: "SCPH-1001 (v2.2 12-04-95 A)"
-    region: [north-america]
+    region: [north-america, latin-america]
     size: 524288
     required: false
     hle_fallback: true