Fix lbb solve_data bug

[ZedongPeng]

Fixes #3132 .

Summary/Motivation:

The solve_data was designed to be removed in both gdpopt and mindtpy. This pull request addresses the omission by removing two instances of solve_data from the gdpopt.lbb code.

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[emma58]

@ZedongPeng, thank you for catching this! Could you please add a test for this fix too?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (42fa578) 88.28% compared to head (dac2f31) 88.28%.
Report is 26 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3133   +/-   ##
=======================================
  Coverage   88.28%   88.28%           
=======================================
  Files         832      832           
  Lines       92307    92307           
=======================================
  Hits        81495    81495           
  Misses      10812    10812           

Flag	Coverage Δ
linux	86.04% <ø> (ø)
osx	75.55% <ø> (ø)
other	86.24% <ø> (ø)
win	83.44% <ø> (ø)

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[emma58]

This looks good, though I'd prefer if you could also add a test that exercises it, @ZedongPeng