violin: update baselines using original mocks

Author: antoinerg

test/image/baselines/groups-over-matching-axes.png

@@ -86,9 +86,6 @@
     }
   ],
   "layout": {
-    "template": {
-      "data": {"violin": [{"bandwidth": 1}]}
-    },
     "boxmode": "group",
     "violinmode": "group",
     "showlegend": false,

test/image/baselines/violin-offsetgroups.png

@@ -66,9 +66,6 @@
     }
   ],
   "layout": {
-    "template": {
-      "data": {"violin": [{"bandwidth": 1}]}
-    },
     "violinmode": "group",
     "showlegend": false,
     "grid": {