neonavigation_rviz_plugins: add costmap_cspace_rviz_plugins as exec dependency

[f-fl0]

This PR fixes the dependencies definition of neonavigation_rviz_plugins to make sure costmap_cspace_rviz_plugins is installed via apt-get

Current master:

sudo apt-get install ros-noetic-neonavigation-rviz-plugins
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following additional packages will be installed:
  ros-noetic-trajectory-tracker-msgs ros-noetic-trajectory-tracker-rviz-plugins
The following NEW packages will be installed:
  ros-noetic-neonavigation-rviz-plugins ros-noetic-trajectory-tracker-msgs ros-noetic-trajectory-tracker-rviz-plugins
0 upgraded, 3 newly installed, 0 to remove and 0 not upgraded.
Need to get 0 B/133 kB of archives.
After this operation, 812 kB of additional disk space will be used.
Do you want to continue? [Y/n] y
Selecting previously unselected package ros-noetic-trajectory-tracker-msgs.
(Reading database ... 467149 files and directories currently installed.)
Preparing to unpack .../ros-noetic-trajectory-tracker-msgs_0.14.0-1focal.20230607.144112_amd64.deb ...
Unpacking ros-noetic-trajectory-tracker-msgs (0.14.0-1focal.20230607.144112) ...
Selecting previously unselected package ros-noetic-trajectory-tracker-rviz-plugins.
Preparing to unpack .../ros-noetic-trajectory-tracker-rviz-plugins_0.11.6-1focal.20230607.144338_amd64.deb ...
Unpacking ros-noetic-trajectory-tracker-rviz-plugins (0.11.6-1focal.20230607.144338) ...
Selecting previously unselected package ros-noetic-neonavigation-rviz-plugins.
Preparing to unpack .../ros-noetic-neonavigation-rviz-plugins_0.11.6-1focal.20230607.144805_amd64.deb ...
Unpacking ros-noetic-neonavigation-rviz-plugins (0.11.6-1focal.20230607.144805) ...
Setting up ros-noetic-trajectory-tracker-msgs (0.14.0-1focal.20230607.144112) ...
Setting up ros-noetic-trajectory-tracker-rviz-plugins (0.11.6-1focal.20230607.144338) ...
Setting up ros-noetic-neonavigation-rviz-plugins (0.11.6-1focal.20230607.144805) ...

[at-wat]

LGTM