Correct detector shape of returned EBSD signal from downsample() #310

Job	Run time
code style	22s
check manifest	11s
ubuntu-latest-py3.10	6m 20s
ubuntu-latest-py3.11-minimum_requirement	4m 56s
windows-latest-py3.10	9m 19s
windows-latest-py3.11	9m 48s
macos-latest-py3.10	3m 15s
macos-latest-py3.11	3m 36s
ubuntu-latest-py3.8-oldest	6m 13s
coveralls-finish	10s
	44m 10s

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