Revert "hal: voice: fix no sound issue in voice call"

This reverts commit 43e14821fa0aafb2166ab71818efcf24110a3de1.

Bug: 30581978
diff --git a/hal/voice.c b/hal/voice.c
index f3250c9..d2215b6 100644
--- a/hal/voice.c
+++ b/hal/voice.c
@@ -124,10 +124,8 @@
     session->state.current = CALL_INACTIVE;
 
     /* Disable sidetone only when no calls are active */
-    if (!voice_is_call_state_active(adev)) {
-        adev->voice.in_call = false;
+    if (!voice_is_call_state_active(adev))
         voice_set_sidetone(adev, uc_info->out_snd_device, false);
-    }
 
     ret = platform_stop_voice_call(adev->platform, session->vsid);