Fix data splat in Flux optimizer version of sciml_train

[ChrisRackauckas]

No description provided.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@68c5571). Click here to learn what that means.
The diff coverage is 100%.

@@            Coverage Diff            @@
##             master     #165   +/-   ##
=========================================
  Coverage          ?   75.58%           
=========================================
  Files             ?        4           
  Lines             ?      172           
  Branches          ?        0           
=========================================
  Hits              ?      130           
  Misses            ?       42           
  Partials          ?        0

Impacted Files	Coverage Δ
src/train.jl	83.33% <100%> (ø)

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