fix(motion_velocity_smoother): fix stop point

[taikitanaka3]

Description

• fix motion velocity smoother stop index
  Note this will read to segmentation fault at edge case

std::vector<autoware_auto_planning_msgs::msg::TrajectoryPoint_<std::allocator<void> >, std::allocator<autoware_auto_planning_msgs::msg::TrajectoryPoint_<std::allocator<void> > > >::_M_range_check(unsigned long) const 

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[tkimura4]

LGTM

[codecov]

Codecov Report

Merging #1694 (123a555) into main (8f7f923) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##             main    #1694   +/-   ##
=======================================
  Coverage   10.72%   10.72%           
=======================================
  Files        1103     1103           
  Lines       78394    78394           
  Branches    18649    18649           
=======================================
  Hits         8409     8409           
  Misses      61071    61071           
  Partials     8914     8914           

Flag	Coverage Δ		*Carryforward flag
differential	3.50% <0.00%> (?)
total	10.71% <0.00%> (ø)		Carriedforward from 8f7f923

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

Impacted Files	Coverage Δ
...ity_smoother/src/motion_velocity_smoother_node.cpp	0.00% <0.00%> (ø)

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