fix path to ProjectGenerator

Now I have the error as below:
```
make[2]: *** No rule to make target `/home/jskuser/ros/hydro/devel/ProjectGenerator', needed by `/home/jskuser/ros/hydro/src/rtm-ros-robotics/rtmros_tutorials/hrpsys_ros_bridge_tutorials/models/pa10.
xml'.  Stop.
make[1]: *** [rtm-ros-robotics/rtmros_tutorials/hrpsys_ros_bridge_tutorials/CMakeFiles/pa10_compile.dir/all] Error 2
```

It is because of the wrong path to ProjectGenerator.