Correct detector shape of returned EBSD signal from downsample() #309

Job	Run time
code style	22s
ubuntu-latest-py3.10	5m 58s
check manifest	11s
ubuntu-latest-py3.11-minimum_requirement	4m 48s
windows-latest-py3.10	9m 18s
windows-latest-py3.11	9m 20s
macos-latest-py3.10	4m 18s
macos-latest-py3.11	4m 46s
ubuntu-latest-py3.8-oldest	4m 45s
coveralls-finish	0s
	43m 46s

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