Fixes issue with datatype setting in gr.Dataframe. Setting no longer dependent on col_count

[cswamy]

Description

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Closes: #6066

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Fixes issue with datatype setting in gr.Dataframe. Setting no longer dependent on col_count

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[abidlabs]

Thanks @cswamy for another contribution! Quick note: as it stands, this would eliminate the ability to set column-by-column datatypes. Let me suggest a change

Edit: never mind, I didn't drink coffee this morning

[abidlabs]

LGTM thanks @cswamy!