fix(heatmap_visualizer): add unknown class

[tkimura4]

Signed-off-by: tomoya.kimura tomoya.kimura@tier4.jp

Description

When the input object topic includes unknown objects, heatmap_visualizer dies with a following message.

This is due to invalid access to heatmaps_ here
I fixed it by adding unknown to class_names_

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[codecov]

Codecov Report

Merging #1781 (c578b87) into main (2f379a6) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##             main    #1781   +/-   ##
=======================================
  Coverage   10.35%   10.35%           
=======================================
  Files        1218     1218           
  Lines       87375    87375           
  Branches    20224    20224           
=======================================
  Hits         9051     9051           
  Misses      68874    68874           
  Partials     9450     9450           

Flag	Coverage Δ		*Carryforward flag
differential	0.00% <ø> (?)
total	10.34% <0.00%> (ø)		Carriedforward from 2f379a6

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

Impacted Files	Coverage Δ
..._localizer/include/ekf_localizer/ekf_localizer.hpp	0.00% <ø> (ø)
localization/ekf_localizer/src/ekf_localizer.cpp	0.00% <0.00%> (ø)

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[shmpwk]

LGTM

[ktro2828]

LGTM