Update cmake reference to python files

Author: nikhil-sethi

snp_motion_planning/CMakeLists.txt

@@ -86,8 +86,8 @@ install(TARGETS ${PROJECT_NAME}_plugins ${PROJECT_NAME}_tasks EXPORT ${PROJECT_N
 ament_python_install_package(${PROJECT_NAME})
 # Install Python executables
 install(PROGRAMS
-  src/motion_client.py
-  src/velocity_plot.py
+  ${PROJECT_NAME}/motion_client.py
+  ${PROJECT_NAME}/velocity_plot.py
   DESTINATION lib/${PROJECT_NAME}
 )