UI Nits: Less Ride Plot xBottom

.. no title needed for time, its obvious, but
   still need to show units if its distance.
UI Nits: Back to black in QA

.. the washed out grey was unpopular and is too
   hard to read.
UI Nits: Matches markers lower

.. so they don't clash with other interval markers
   most especially user supplied interval marks
UI Nits: Matches markers in CWBAL color