(moveit_rviz) Correct fixed frame. 

With [this commit](https://github.com/tork-a/rtmros_nextage/commit/ed83e8a01b86a68138309d22cb920e4de941d73a#diff-e4da40d57291cf6466a68db80dadc721), moveit launch file in this package refers `rviz` config in hironx package, where the fixed frame on RViz is `WAIST`, not `WAIST_Link` that's default in Nextage. 

At least that misconfiguration disables `Interactive Marker`. This PReq re-enables it to appear.