Fix DANDI User Guide Part I: uncomment a working default dandiset

[bendichter]

The example-selector cell had all four candidate (dandiset_id, filepath) pairs commented out, so the next cell hit NameError: name 'dandiset_id' is not defined on a run-all-cells. The original intent seemed to be that a user manually edits the cell, but a notebook should still execute end-to-end out of the box (and the next cells in the guide assume dandiset_id/filepath are set).

Verified current asset existence for all four candidates against the live DANDI API:

Dandiset	Path	Status
000054	sub-F2/sub-F2_ses-20190407T210000_behavior+ophys.nwb	gone
000053	sub-npI1/sub-npI1_ses-20190415_behavior+ecephys.nwb	gone
000022	sub-744912845/sub-744912845_ses-766640955.nwb	exists ✓
000003	sub-YutaMouse41/sub-YutaMouse41_ses-YutaMouse41-150831_behavior+ecephys.nwb	gone

Uncommented the 000022 line — the only one that currently resolves. Left the other three commented untouched (they'd need fresh paths from the current dandiset state; out of scope here).

Caught by the headless test sweep of #149.

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[h-mayorquin]

I verified the four candidates against the live DANDI API and three of the four actually resolve, not one only one 000053/sub-npI1/sub-npI1_ses-20190415_behavior+ecephys.nwb (44.5 GB) and 000003/sub-YutaMouse41/sub-YutaMouse41_ses-YutaMouse41-150831_behavior+ecephys.nwb (14.5 GB) are both still there, alongside 000022 (2.75 GB).

The code change is still good: 000022 is the smallest, so it's a sensible default but the PR description's rationale ("the only one that currently resolves") is incorrect and I am wondering if #149 script might have something or if this was just a fluke on the agent PR description. I think is worth double checking.