If animDelete() was called with prefs.animation_speed == 0, the
object would not be marked for deletion, as opposed to calling
with prefs.animation_speed != 0. This would leak the objects.
Therefore delete the objects if called with prefs.animation_speed == 0.
The caller doesn't keep a reference to the objects. Therefore,
a plain delete is fine, as opposed to a deleteLater().
While touching this function, use the function-pointer version
of connect().
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
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