sidetone: Use IGNORE_UI_GAINS effect

BUG=b:371505214
TEST=Adjust UI gain, make sure sidetone volume is not changed

Change-Id: I0cbb16cf6576e023c0b1e790533046143c5ea8da
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/adhd/+/5906968
Reviewed-by: Li-Yu Yu <aaronyu@google.com>
Commit-Queue: Norman Bintang <normanbt@chromium.org>
Tested-by: chromeos-cop-builder@chromeos-cop.iam.gserviceaccount.com <chromeos-cop-builder@chromeos-cop.iam.gserviceaccount.com>

cras/src/server/sidetone.c

@@ -38,12 +38,12 @@ static bool need_echo_cancellation(enum CRAS_NODE_TYPE output_node_type) {
 
 bool enable_sidetone(struct stream_list* stream_list,
                      enum CRAS_NODE_TYPE output_node_type) {
-  int effects = 0;
+  int effects = IGNORE_UI_GAINS;
   int block_size = DEFAULT_SERVER_STREAM_BLOCK_SIZE;
   if (need_echo_cancellation(output_node_type)) {
     // Set higher block size so it has higher latency and prevent the audio
     // being cancelled by the echo cancellation.
-    effects = APM_ECHO_CANCELLATION;
+    effects |= APM_ECHO_CANCELLATION;
     block_size = 8192;
   }