Errors in IO plugin tests using dask.keys()

[hakonanes]

Two tests of the NORDIF and h5ebsd IO plugins looking through dask.array.dask.keys() strings fail on HyperSpy's extension integration tests:

kikuchipy/kikuchipy/io/plugins/tests/test_nordif.py

Lines 345 to 355 in 8533715

	def test_load_readonly(self):
	s = load(PATTERN_FILE, lazy=True)
	k = next(
	filter(
	lambda x: isinstance(x, str) and x.startswith("array-original"),
	s.data.dask.keys(),
	)
	)
	mm = s.data.dask[k]
	assert isinstance(mm, np.memmap)
	assert not mm.flags["WRITEABLE"]

kikuchipy/kikuchipy/io/plugins/tests/test_h5ebsd.py

Lines 289 to 298 in 8533715

	def test_load_readonly(self):
	s = load(KIKUCHIPY_FILE, lazy=True)
	k = next(
	filter(
	lambda x: isinstance(x, str) and x.startswith("array-original"),
	s.data.dask.keys(),
	)
	)
	mm = s.data.dask[k]
	assert isinstance(mm, Dataset)

[hakonanes]

Key is original-array in latest dask versions, so we should just check for both as is done in hyperspy/hyperspy#2888.