Fix Flash Zero datamodule kwargs

[ethanwharris]

What does this PR do?

Fixes #993

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[codecov]

Codecov Report

Merging #994 (07c0dc2) into master (504c4c2) will increase coverage by 3.39%.
The diff coverage is 91.66%.

@@            Coverage Diff             @@
##           master     #994      +/-   ##
==========================================
+ Coverage   85.00%   88.40%   +3.39%     
==========================================
  Files         250      250              
  Lines       13190    13199       +9     
==========================================
+ Hits        11212    11668     +456     
+ Misses       1978     1531     -447     

Flag	Coverage Δ
unittests	88.40% <91.66%> (+3.39%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
flash/tabular/forecasting/cli.py	100.00% <ø> (ø)
flash/core/utilities/flash_cli.py	94.24% <91.66%> (-0.38%)	⬇️
flash/core/data/data_module.py	95.39% <0.00%> (+1.06%)	⬆️
flash/core/utilities/stages.py	78.26% <0.00%> (+4.34%)	⬆️
flash/text/seq2seq/translation/model.py	68.18% <0.00%> (+4.54%)	⬆️
flash/text/seq2seq/summarization/model.py	80.00% <0.00%> (+5.00%)	⬆️
flash/core/integrations/labelstudio/input.py	86.59% <0.00%> (+5.58%)	⬆️
flash/text/seq2seq/core/model.py	68.88% <0.00%> (+8.88%)	⬆️
flash/text/classification/model.py	91.83% <0.00%> (+14.28%)	⬆️
flash/text/question_answering/finetuning.py	23.52% <0.00%> (+19.60%)	⬆️
... and 6 more

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