DMDetector: fix nasty x <-> y parameter order bug in DetectPure #190

Job	Run time
build-android	3m 28s
build-ios	8m 18s
build (windows-latest)	4m 20s
build-experimental (windows-latest)	2m 31s
build (ubuntu-latest)	1m 32s
build-kn	3m 41s
build-experimental (ubuntu-latest)	56s
build-python (3.12, ubuntu-latest)	1m 8s
build (macos-13)	2m 14s
build-experimental (macos-13)	1m 10s
build-python (3.12, macos-13)	1m 17s
build-rust (ubuntu-latest)	1m 44s
build-python (3.12, windows-latest)	3m 11s
build-rust (macos-13)	3m 31s
build-ubuntu-sanitize	2m 59s
build-wasm	1m 17s
build-rust (windows-latest)	3m 54s
build-winrt	2m 13s
	49m 24s

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