Update enumerations exception message.

[shaunrd0]

Unless I missed some testing done on earlier core versions I think we can just remove the version check here since TileDB dev has corrected the error message and it will not be present in 2.27.

For context, I had changed this message in TileDB-Inc/TileDB#5291 by adding a check earlier in the code with a different message. We essentially decided to revert those changes to fix a performance regression in TileDB-Inc/TileDB#5349 so the exception message returned to the previous format.

[kounelisagis]

Thanks for opening the PR, @shaunrd0! It looks good.

My only concern -and if I remember correctly, it was also @ihnorton's concern- is the error message. 'Unable to check if unknown enumeration is loaded' doesn't seem to make much sense in that context. But it may be unrelated to this PR.

[kounelisagis]

Should fix the related error in TileDB-Inc/centralized-tiledb-nightlies#24
cc @jdblischak

[ihnorton]

As long as this works against 2.26 and 2.27 I'm ok with it.

[shaunrd0]

As long as this works against 2.26 and 2.27 I'm ok with it.

Yep the change was reverted in 2.26 as well.