"board_sidebar_time_tracker.vue" wraps "time_tracker.vue"
(to be used in boards swimlane sidebar.)

Add "showCollapsed" prop to "time_tracker.vue".
Because the swimlanes sidebar is not collapsible,
"time-tracking-collapsed-state" should not be rendered
and "showCollapsed" is used to control this behavior in
"time_trakcer.vue"

Remove rootPath prop from time_tracker spec because
it isn't used in the component.

Remove "padding-bottom" and "border-bottom"
from ".time_tracker" class (these were unused)

Rename css class ".time_tracker" to ".time-tracker"