Correct detector shape of returned EBSD signal from downsample() #311

Job	Run time
check manifest	7s
code style	24s
ubuntu-latest-py3.10	5m 33s
ubuntu-latest-py3.11-minimum_requirement	4m 40s
windows-latest-py3.10	8m 56s
windows-latest-py3.11	10m 7s
macos-latest-py3.10	3m 37s
macos-latest-py3.11	3m 17s
ubuntu-latest-py3.8-oldest	6m 13s
coveralls-finish	9s
	43m 3s

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