Fix copy-paste mistake in WindowBuilder::build #536

Job	Run time
build linux pkg-config	1m 31s
build bundled (macos-latest)	2m 37s
build vcpkg (macos-latest)	3m 57s
build bundled (ubuntu-latest)	2m 14s
build vcpkg (ubuntu-latest)	7m 8s
build vcpkg (windows-latest)	8m 58s
build bundled (windows-latest)	7m 37s
build bundled (--release, macos-latest)	2m 32s
build bundled (--release, ubuntu-latest)	2m 9s
build bundled (--release, windows-latest)	8m 46s
build bundled (static-link, macos-latest)	3m 6s
build bundled (static-link, ubuntu-latest)	2m 26s
build bundled (static-link, windows-latest)	4m 38s
build bundled (static-link, --release, macos-latest)	2m 30s
build bundled (static-link, --release, ubuntu-latest)	2m 24s
build bundled (static-link, --release, windows-latest)	8m 49s
	1h 11m 22s

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