Bug fix in parameters for gandlf_collectStats

[dlang95]

Change
inputDir = os.path.normpath(args.inputDir) to:
inputDir = os.path.normpath(args.modelDir) to match actual args (no inputDir argument)

• Fixes argument parsing to allow for proper usage

Checklist

• [X ] I have read the CONTRIBUTING guide
• [ X] My PR is based from the current GaNDLF master
• [X ] Non-breaking change (would not break existing functionality): please provide as many details as possible for any breaking change
• [ X] Function/class source code documentation added/updated
• Code has been blacked for style consistency
• If applicable, version information has been updated in GANDLF/version.py
• If adding a git submodule, add to list of exceptions for black styling in pyproject.toml file
• Usage documentation has been updated, if appropriate
• History has been updated, if appropriate
• Tests added or modified to cover the changes; if coverage is reduced, please give explanation

[sarthakpati]

LGTM!

[codecov]

Codecov Report

Merging #321 (a5f1334) into master (61af13f) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #321   +/-   ##
=======================================
  Coverage   88.59%   88.59%           
=======================================
  Files          85       85           
  Lines        4418     4418           
=======================================
  Hits         3914     3914           
  Misses        504      504           

Flag	Coverage Δ
unittests	88.59% <ø> (ø)

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