AudioFlinger: Ensure PatchTrack has unity gain

Test: atest AudioPlaybackCaptureTest
Bug: 317212590
Bug: 362363068
Flag: EXEMPT bugfix
Change-Id: I61a86c21d65b3f3b6ef42bf40d4ef500155cd251
diff --git a/services/audioflinger/AudioFlinger.cpp b/services/audioflinger/AudioFlinger.cpp
index 5a79ef6..0b0e26a 100644
--- a/services/audioflinger/AudioFlinger.cpp
+++ b/services/audioflinger/AudioFlinger.cpp
@@ -4063,7 +4063,7 @@
                                                        0ns /* timeout */,
                                                        frameCountToBeReady,
                                                        track->getSpeed(),
-                                                       track->getPortVolume());
+                                                       1.f /* volume */);
         status = patchTrack->initCheck();
         if (status != NO_ERROR) {
             ALOGE("Secondary output patchTrack init failed: %d", status);