Fix dangling tooltips when rendering the CallInfoView again

When the CallInfoView is rendered again the parent elements of the
previous tooltips are removed. However, if a tooltip was being shown the
tooltip was never hidden, as its parent no longer existed and thus was
never unhovered. Now tooltips are explicitly disposed when the view is
rendered again.

Signed-off-by: Daniel Calviño Sánchez <danxuliu@gmail.com>