Revert two instances of num_active_spatial_layers.
Revert two instances of num_active_spatial_layers.

The variable, num_active_spatial_layers, is used to construct ssData.
This CL reverts two instances of num_active_spatial_layers not
related to ssData construction.

Bug: None
Change-Id: I4d90d4578684dfdf8bd5a39c7a2fe778fce4414c
Reviewed-on: https://webrtc-review.googlesource.com/85643
Commit-Queue: Michael Horowitz <1102f2de1330857c46b7dcc057d19df8c909838c@webrtc.org>
Reviewed-by: Sergey Silkin <fc631354f276613a5410ea259cf4618b2846d39b@webrtc.org>
Reviewed-by: Rasmus Brandt <9545de3a34b925a736ae2b5ee593f3033f743a28@webrtc.org>
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#23756}
TimothyGu/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc