Correct detector shape of returned EBSD signal from downsample() #304

Job	Run time
check manifest	8s
ubuntu-latest-py3.10	5m 43s
code style	15s
ubuntu-latest-py3.11-minimum_requirement	4m 54s
windows-latest-py3.10	9m 41s
windows-latest-py3.11	10m 31s
macos-latest-py3.10	1m 24s
macos-latest-py3.11	1m 2s
ubuntu-latest-py3.7-oldest	4m 34s
coveralls-finish	0s
	38m 12s

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