Fix messy carpet mock

Author: rreusser

test/image/baselines/cheater_fully_filled.png

@@ -40,7 +40,7 @@
       "text": "These two fills differ only in a tiny threshold that affects whether the<br>contour fills the whole region or cuts off a sliver on the left side.<br> They should be effectively identical, not complementary.",
       "align": "left",
       "showarrow": false,
-      "x": 1.5,
+      "x": 0.5,
       "y": 2.5,
       "xref": "x",
       "yref": "y"