Fix missing -D in cmake opts setting

* Bug found using copilot review

Author: droidmonkey

release-tool.py

@@ -755,7 +755,7 @@ def build_windows(self, version, src_dir, output_dir, *, parallelism, cmake_opts
         # Setup build signing if requested
         if sign:
             cmake_opts.append(f'-DWITH_XC_CODESIGN_IDENTITY={sign_identity}')
-            cmake_opts.append(f'-WITH_XC_CODESIGN_TIMESTAMP_URL={sign_timestamp_url}')
+            cmake_opts.append(f'-DWITH_XC_CODESIGN_TIMESTAMP_URL={sign_timestamp_url}')
         # Use vcpkg for dependency deployment
         cmake_opts.append('-DX_VCPKG_APPLOCAL_DEPS_INSTALL=ON')