Fix index in CCPACSFuselageProfiles::GetProfile

[merakulix]

This fixes an error that occurred in PR #1083. When updating the getter functions regarding const correctness, the decrement by 1 of the index was lost.

Description

How Has This Been Tested?

Screenshots, that help to understand the changes(if applicable):

Checklist:

Task	Finished	Reviewer Approved
At least one test for the new functionality was added.	yes does not apply	OK
New classes have been added to the Python interface.	yes does not apply	OK
The code is properly documented with doxygen docstrings	yes does not apply	OK
Changes are documented at the top of ChangeLog.md	yes does not apply	OK

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.

Project coverage is 69.91%. Comparing base (82bdf2c) to head (5d62da2).

Files with missing lines	Patch %	Lines
src/fuselage/CCPACSFuselageProfiles.cpp	0.00%	6 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1110   +/-   ##
=======================================
  Coverage   69.91%   69.91%           
=======================================
  Files         294      294           
  Lines       27285    27285           
=======================================
  Hits        19075    19075           
  Misses       8210     8210           

Flag	Coverage Δ
unittests	69.91% <0.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
src/fuselage/CCPACSFuselageProfiles.cpp	46.80% <0.00%> (ø)

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.