Corrected delta reader key from table to source_table

[ravi-databricks]

Corrected delta source table key from "table" to "source_table"

[JoeBarcus]

Looks good.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.90%. Comparing base (51a98f4) to head (2ad65e6).
Report is 6 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #54   +/-   ##
=======================================
  Coverage   89.90%   89.90%           
=======================================
  Files           8        8           
  Lines         832      832           
  Branches      161      161           
=======================================
  Hits          748      748           
  Misses         33       33           
  Partials       51       51           

Flag	Coverage Δ
unittests	89.90% <ø> (ø)

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