Call the common 7.1 wide channel layout "7.1(wide)".

Rename the uncommon variant with side speakers to "7.1(wide-side)".

libavutil/channel_layout.c

@@ -97,7 +97,8 @@ static const struct {
     { "7.0",         7,  AV_CH_LAYOUT_7POINT0 },
     { "7.0(front)",  7,  AV_CH_LAYOUT_7POINT0_FRONT },
     { "7.1",         8,  AV_CH_LAYOUT_7POINT1 },
-    { "7.1(wide)",   8,  AV_CH_LAYOUT_7POINT1_WIDE },
+    { "7.1(wide)",   8,  AV_CH_LAYOUT_7POINT1_WIDE_BACK },
+    { "7.1(wide-side)",   8,  AV_CH_LAYOUT_7POINT1_WIDE },
     { "octagonal",   8,  AV_CH_LAYOUT_OCTAGONAL },
     { "downmix",     2,  AV_CH_LAYOUT_STEREO_DOWNMIX, },
 };