fix: remove 'local' keyword outside function in ISO build script

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

image-recipe/build-auto-installer-iso.sh

@@ -509,7 +509,7 @@ fi
 BACKEND_CAPTURED=0
 if [ "$BUILD_FROM_SOURCE" != "1" ]; then
     # Direct copy from ARCHIPELAGO_BIN env, local install, or remote
-    local BIN="${ARCHIPELAGO_BIN:-/usr/local/bin/archipelago}"
+    BIN="${ARCHIPELAGO_BIN:-/usr/local/bin/archipelago}"
     if [ -f "$BIN" ]; then
         cp "$BIN" "$ARCH_DIR/bin/archipelago"
         chmod +x "$ARCH_DIR/bin/archipelago"