fix(compare_map_segmentation): fix namespace block syntax error

[danieltaciak]

Description

Fixed syntax error in multi_voxel_grid_map_update header:
Namespace block should not end with semicolon as stated in cpp reference:
https://en.cppreference.com/w/cpp/language/namespace

This error breaks the build with some c++ compiler versions

Tests performed

Built on aarch64 and x86 platforms.

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[badai-nguyen]

@danieltaciak Thank you for your PR. FYI, I'm also working on compare map here #3277 and going to refactor multi_voxel_grid_map_update.hpp .

[yukkysaito]

LGTM

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (3aead0d) 12.33% compared to head (9f0ecd4) 12.33%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3374   +/-   ##
=======================================
  Coverage   12.33%   12.33%           
=======================================
  Files        1381     1381           
  Lines       96627    96627           
  Branches    27925    27925           
=======================================
  Hits        11919    11919           
  Misses      72079    72079           
  Partials    12629    12629           

Flag	Coverage Δ		*Carryforward flag
differential	0.00% <ø> (?)
total	12.33% <ø> (ø)		Carriedforward from 3aead0d

*This pull request uses carry forward flags. Click here to find out more.

Impacted Files	Coverage Δ
...e_map_segmentation/multi_voxel_grid_map_update.hpp	0.00% <ø> (ø)

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