In carousel snippet, the target element for background snippet option is
being changed manually. So for the new target, we have to rebind the
associated events that were bound in `start` function of the snippet
option. For that, some code is extracted from the `start` function and
is used to rebind necessary events for new targets.
In particular, this was preventing the carousel slides' backgrounds to
be automatically removed when a background-color was selected.
Dharmraj Jhala
dbdbfa7432