Default the install prompts to yes

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

build-windows-base.sh

@@ -126,9 +126,9 @@ fi
 if [[ -z "${WIN11_VM_INSTALL_ISO:-}" ]] && ! "$downloader" --print-path windows11 --iso >/dev/null 2>&1; then
   "$downloader" --print-path windows11 --iso >&2 || true
   if { : </dev/tty >/dev/tty; } 2>/dev/null; then
-    printf 'Download the Windows 11 ISO now? [y/N] ' >/dev/tty
+    printf 'Download the Windows 11 ISO now? [Y/n] ' >/dev/tty
     read -r answer </dev/tty || answer=
-    [[ "$answer" == [yY] || "$answer" == [yY][eE][sS] ]] || exit 1
+    [[ -z "$answer" || "$answer" == [yY] || "$answer" == [yY][eE][sS] ]] || exit 1
     "$downloader" windows11 || exit 1
   fi
 fi