Use correct table col name

[jwlodek]

Resolves bluesky/ophyd-async#639

Before this change:

In [10]: await panda1.data.datasets.get_value()
An exception has occurred, use '%tb verbose' to see the full traceback.
ValidationError: 1 validation error for DatasetTable
type
  Extra inputs are not permitted [type=extra_forbidden, input_value=['float64'], input_type=list]
    For further information visit https://errors.pydantic.dev/2.9/v/extra_forbidden

See /home/xf31id/.cache/bluesky/log/bluesky.log for the full traceback.

After this change:

In [11]: await test_panda.data.datasets.get_value()
Out[11]: DatasetTable(name=[], hdf5_type=[])

In [12]: await test_panda.data.datasets.get_value()
Out[12]: DatasetTable(name=['TrigTS'], hdf5_type=[<PandaHdf5DatasetType.FLOAT_64: 'float64'>])

note the second column title is just HDF5_Type, instead of just Type.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.67%. Comparing base (1e1e8cd) to head (d7ac04a).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #151      +/-   ##
==========================================
- Coverage   91.75%   91.67%   -0.08%     
==========================================
  Files           8        8              
  Lines        1394     1394              
  Branches      164      164              
==========================================
- Hits         1279     1278       -1     
  Misses         82       82              
- Partials       33       34       +1     

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