remove uids from mock

Author: keeganmccallum

test/image/mocks/bar_stackto100_negative.json

@@ -4,29 +4,25 @@
             "name":"Col1",
             "y":["1","2","3","4","5"],
             "x":["1","2","3","4","5"],
-            "type":"bar",
-            "uid":"aeb9ea"
+            "type":"bar"
         },
         {
             "name":"Col2",
             "y":["2","3","4","3","2"],
             "x":["1","2","3","4","5"],
-            "type":"bar",
-            "uid":"2f201d"
+            "type":"bar"
         },
         {
             "name":"Col3",
             "y":["5","4","3","2","1"],
             "x":["1","2","3","4","5"],
-            "type":"bar",
-            "uid":"aef0bf"
+            "type":"bar"
         },
         {
             "name":"Col4",
             "y":["-1","0","1","0","-1"],
             "x":["1","2","3","4","5"],
-            "type":"bar",
-            "uid":"330b4d"
+            "type":"bar"
         }
     ],
     "layout":{