Always fade the main early and late delay taps

Always fade the main early and late delay taps

These were actually missing from the current check for fading. But the EFX
documentation suggests these (along with the early/late gain and panning) can
be adjusted often without invoking a full change, as dynamically modeling an
environment would continually change these properties as the listener moves
around (changing the direction and distance to the reflective surfaces). So
ensuring they're kept up-to-date would be the way to go.