[BUG] "Crossfader force center" events are ignored

[jummy0]

Describe the bug The "crossfader force center" event is used to remove crossfades on lower difficulties, to avoid deleting so many notes. These are common in official FSG charts. Dj-Engine v1.5 ignores these events and shows the crossfades anyway.

To Reproduce Steps to reproduce the behavior:

1. Play a song on easy (DJH2's "American Boy" beat juggle, for example)
2. Watch for crossfades

Expected behavior The crossfades within the "force center" event should be ignored

Screenshots Crossfades in DJH2's "War vs. Waters of Nazareth", easy difficulty.

Desktop (please complete the following information):

• OS: Windows 10 v1903