The "Leave Current/Switch/Select" Session button was sometimes
wrapping its text if it wasn't given enough horizontal space.
Now it should never wrap, instead stealing space from the
dropdown next to it (or being bumped to a line below the dropdown).
LEARNER-3668
LEARNER-3438
The user can now enroll in a session, unenroll from a session or change session
from a new course enrollment card on the programs dashboard.
