Fix indentation of HLSL source expression #4273

Job	Run time
build-solution (Debug, x64)	11m 31s
build-packages	8m 44s
build-solution (Debug, arm64)	16m 30s
build-solution (Release, x64)	20m 12s
build-solution (Release, arm64)	20m 38s
verify-packages (net7.0)	2m 37s
verify-packages (net6.0)	7m 58s
verify-packages (net472)	1m 17s
run-tests-win2d (Debug, uwp)	6m 15s
run-tests-d3d12ma (net7.0)	5m 43s
run-tests-win2d (Debug, wasdk)	5m 22s
run-samples (net7.0)	5m 16s
run-tests-d3d12ma (net6.0)	6m 37s
run-tests-win2d (Release, uwp)	12m 8s
run-tests (net7.0)	8m 5s
run-samples (net6.0)	4m 42s
run-tests-win2d (Release, wasdk)	9m 23s
run-tests (net6.0)	9m 22s
run-samples (net472)	5m 1s
run-tests (net472)	9m 42s
run-samples-aot (x64)	10m 54s
run-samples-aot (arm64)	4m 19s
publish-nightlies-azure-devops	25s
publish-nightlies-github	20s
	3h 13m 1s

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