Fix indexing issue in GetSanitizedCategoryName

[dariusclay]

Small trivial update. Fixes #1174.

Changes

Change variable used to index result string.

For significant contributions please make sure you have completed the following items:

• Appropriate CHANGELOG.md updated for non-trivial changes
• Design discussion issue #
• Changes in public API reviewed

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: dariusclay / name: Darius Letterman (fcb5ef8)

[Kielek]

@dariusclay, is it worth to add some test to cover this scenario? Just to prevent regression.

[codecov]

Codecov Report

Merging #1175 (fcb5ef8) into main (71a7216) will not change coverage.
The diff coverage is 0.00%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1175   +/-   ##
=======================================
  Coverage   72.81%   72.81%           
=======================================
  Files         244      244           
  Lines        8787     8787           
=======================================
  Hits         6398     6398           
  Misses       2389     2389           

Impacted Files	Coverage Δ
...etry.Exporter.Geneva/TLDExporter/TldLogExporter.cs	37.11% <0.00%> (ø)

[utpilla]

@dariusclay Thanks for creating this PR!