Remove fastrtps_cmake_module from CMakeLists.txt (#248)

Signed-off-by: Antón Casas <antoncasas@eprosima.com>

Author: 4ntn

micro_ros_agent/CMakeLists.txt

@@ -35,7 +35,6 @@ find_package(microxrcedds_agent REQUIRED)
 find_package(rosidl_cmake REQUIRED)
 find_package(fastcdr REQUIRED)
 find_package(fastdds REQUIRED)
-find_package(fastrtps_cmake_module REQUIRED)
 find_package(rmw_dds_common REQUIRED)
 find_package(rmw REQUIRED)
 find_package(rcutils REQUIRED)