fix mock

Author: emilykl

Diff for: test/image/mocks/zz-text_on_shapes_texttemplate.json

@@ -215,8 +215,7 @@
             {
                 "label": {
                     "texttemplate": "paths have no slope: %{slope}",
-                    "textposition": "top center",
-                    "yanchor": "bottom"
+                    "textposition": "top center"
                 },
                 "editable": true,
                 "path": "M3.71,0.75L2.26,3.99L3.71,3.99Z",