Fix fetching position dataframe in SortedSpikesDecodingV1.get_ahead_behind_distance()

[calderast]

Description

fetch_position_info returns a tuple of (position_info, position_variable_names), but the .loc here is supposed to operate on just the dataframe. Fix it to grab the position_info dataframe only

spyglass/src/spyglass/decoding/v1/sorted_spikes.py

Lines 639 to 641 in 2d7bc52

	position_info = self.fetch_position_info(self.fetch1("KEY")).loc[
	time_slice
	]

Checklist:

• N/A. If this PR should be accompanied by a release, I have updated the CITATION.cff
• N/A. If this PR edits table definitions, I have included an alter snippet for release notes.
• N/A. If this PR makes changes to position, I ran the relevant tests locally.
• N/A. If this PR makes user-facing changes, I have added/edited docs/notebooks to reflect the changes
• I have updated the CHANGELOG.md with PR number and description.

[CBroz1]

The failing tests might be addressed by merging #1534 and fetching upstream