fix(rviz_plugin): fix screen capture plugin

[taikitanaka3]

Signed-off-by: tanaka3 ttatcoder@outlook.jp

Description

resolve #1491
fix setting empty filename before updating

check to capture screen and see files
note: capture/1970-01-01-09-00-41.mp4 is created with simulation time

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[codecov]

Codecov Report

Merging #1492 (54f06af) into main (08d7a12) will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main    #1492      +/-   ##
==========================================
- Coverage   10.37%   10.36%   -0.01%     
==========================================
  Files        1135     1135              
  Lines       79575    79611      +36     
  Branches    18549    18549              
==========================================
  Hits         8254     8254              
- Misses      63107    63143      +36     
  Partials     8214     8214              

Flag	Coverage Δ		*Carryforward flag
differential	0.00% <0.00%> (?)
total	10.35% <0.00%> (ø)		Carriedforward from 08d7a12

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

Impacted Files	Coverage Δ
...n_capture_rviz_plugin/src/screen_capture_panel.cpp	0.00% <0.00%> (ø)
...n_capture_rviz_plugin/src/screen_capture_panel.hpp	0.00% <ø> (ø)
...or_path_planner/src/behavior_path_planner_node.cpp	0.22% <0.00%> (ø)

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[tkimura4]

LGTM