Combine the reverb decorrelator delay line with the main delay line

Combine the reverb decorrelator delay line with the main delay line

Since it was merely acting as an extension of it anyway, with the second delay
line tap (for late reverb) copying attenuated samples to the decorrelator line
that was being tapped off of. Just extend the delay line and offset the
decorrelator taps to be relative to the late reverb tap.