catalyst-hook 15.9-6
catalyst-libgl 15.9-2
catalyst-utils 15.9-2
mlt 0.9.8-3
qt5-base 5.5.1-3
kdenlive git describe --tags --always
v15.11.80-53-g0918054

Composite Transitions' wipe file settings changes don't affect the transition once one image has been selected.

Steps to reproduce:
1. create two different color clips, drag them to timeline on top of each other, create transition between them
2. set transition to composite, add keyframe at end, set opacity at either keyframe to 0
3. select a wipe file, check if it works, it works
4. select none as wipe file, check if it works, it doesn't
5. select another wipe file, check if it works, it doesn't

Video: https://youtu.be/xLbYkoEqP3Y

This seems to be related to https://bugs.kde.org/show_bug.cgi?id=354806