Fix column name Peptide Monoisotopic Mass in FlashLFQ writing

[RalfG]

Fixed

• io.flashlfq: Fix column name Peptide Monoisotopic Mass in FlashLFQ writing.

[codecov]

Codecov Report

Attention: Patch coverage is 87.50000% with 1 line in your changes missing coverage. Please review.

Project coverage is 67.68%. Comparing base (565934a) to head (83bcdfd).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
psm_utils/io/flashlfq.py	85.71%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #97   +/-   ##
=======================================
  Coverage   67.68%   67.68%           
=======================================
  Files          27       27           
  Lines        2627     2627           
=======================================
  Hits         1778     1778           
  Misses        849      849           

Flag	Coverage Δ
unittests	67.68% <87.50%> (ø)

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