kcms/effects: Add "tile"-related keywords
Ultimately the best solution would be to implement https://bugs.kde.org/show_bug.cgi?id=462722, but that hasn't been done yet, so for now let's use the existing approach of adding the names of effects into the keywords list for this KCM to surface those effects at the system level so e.g. people can find them with KRunner.
BUG: 467279 FIXED-IN: 6.0