fix: Set posfilter files to no longer load when --from-cache set

[johnbdesanto]

This is a one-line fix that solves an issue where setting the "--from-cache" flag would not prevent gnatss from loading input files declared in the posfilter mode of the config file. Since some of these files are large (INSPVAA and INSSTDEVA files can be 10s of Gb) this saves a noticeable amount of processing time when --from-cache is set.

The actual functionality of gnatss when --from-cache is declared is not affected since it only runs the solver. Posfilter operations are not performed in this case.

Gnatss can still be run in posfilter mode when --from-cache is not declared, either by declaring --posfilter or by default.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.38%. Comparing base (d028023) to head (2cf86da).
Report is 41 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #302      +/-   ##
==========================================
+ Coverage   76.31%   76.38%   +0.06%     
==========================================
  Files          29       29              
  Lines        1786     1791       +5     
==========================================
+ Hits         1363     1368       +5     
  Misses        423      423              

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[lsetiawan]

This looks great! I like the tiny change and big difference kind of PRs! 🥳 You'll probably need to merge #301 first then this PR