remove extra ; that cause a warning

[TomCC7]

error message:

--- stderr: drake_ros
/workspace/codes/cc_control_ws/src/drake-ros/drake_ros/viz/scene_markers_system.cc:39:58: error: extra ‘;’ [-Werror=pedantic]
   39 |   DRAKE_NO_COPY_NO_MOVE_NO_ASSIGN(SceneGeometryToMarkers);
      |                                                          ^
      |                                                          -
cc1plus: all warnings being treated as errors

---

This change is 

[jwnimmer-tri]

Apologies for the trouble, and thanks for bringing to our attention.

The lack of a semicolon is deprecated in the current Drake nightlies, and the semicolon will be strictly required in a future Drake release. So we need to keep the semicolon there.

Instead, I've filed #360 which hopefully fixes the error. Turning on -Werror=pedantic is aggressively disruptive, so the build should never have done that in the first place.

[jwnimmer-tri]

Closing in lieu of #360. If that PR doesn't actually fix your problem, just let us know.