file aout: do not apply volume (refs #6262)

In my opinion, amplifying the audio that gets recorded to a file may do
more harm than good. Indeed, there is no direct feedback to detect and
correct saturation or distortion.
(cherry picked from commit 02a2074e054a237876a2c980621cbc0969dd72a4)

modules/audio_output/file.c

@@ -193,10 +193,8 @@ static int Open( vlc_object_t * p_this )
     {
         p_aout->format.i_bytes_per_frame = AOUT_SPDIF_SIZE;
         p_aout->format.i_frame_length = A52_FRAME_NB;
-        aout_VolumeNoneInit( p_aout );
     }
-    else
-        aout_VolumeSoftInit( p_aout );
+    aout_VolumeNoneInit( p_aout );
 
     /* Channels number */
     i_channels = var_CreateGetInteger( p_this, "audiofile-channels" );