Correct detector shape of returned EBSD signal from downsample() #303

Job	Run time
check manifest	10s
ubuntu-latest-py3.10	5m 54s
code style	22s
ubuntu-latest-py3.11-minimum_requirement	4m 39s
windows-latest-py3.10	8m 14s
windows-latest-py3.11	10m 18s
macos-latest-py3.10	1m 14s
macos-latest-py3.11	1m 4s
ubuntu-latest-py3.7-oldest	5m 5s
coveralls-finish	0s
	37m 0s

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