base_rgbd_camera_optical_frame on static_transform

Note that there are other launch files affected.
Should I also fix them?

```
softkinetic_cameras.launch
9:  		<param name="camera_link" type="string" value="softkinetic_left_link" />
16:  		<param name="camera_link" type="string" value="softkinetic_right_link" /> 

softkinetic_camera_demo.launch
8:    <param name="camera_link" type="string" value="/softkinetic_camera_link" />
22:        args="0 0 0 0 0 1.2 /base /softkinetic_camera_link 40" />
```