Remove redundant keys in cheater mock

Author: rreusser

test/image/mocks/carpet_axis.json

@@ -13,7 +13,6 @@
         "title": "length, l, m",
         "ticksuffix": "m",
         "tickformat": ".3s",
-        "smoothing": 1,
         "tickmode": "linear",
         "tick0": 1e-7,
         "dtick": 2e-7,
@@ -25,7 +24,6 @@
         "title": "pressure, p, Pa",
         "ticksuffix": "Pa",
         "tickformat": ".3s",
-        "smoothing": 1,
         "tickmode": "linear",
         "tick0": 100000,
         "dtick": 200000,
@@ -70,7 +68,6 @@
         "title": "length, l, m",
         "ticksuffix": "m",
         "tickformat": ".3s",
-        "smoothing": 1,
         "tickmode": "array",
         "arraytick0": 1,
         "arraydtick": 2,
@@ -82,7 +79,6 @@
         "title": "pressure, p, Pa",
         "ticksuffix": "Pa",
         "tickformat": ".3s",
-        "smoothing": 1,
         "tickmode": "array",
         "arraytick0": 2,
         "arraydtick": 4,
@@ -107,7 +103,6 @@
         "title": "length, l, m",
         "ticksuffix": "m",
         "tickformat": ".3s",
-        "smoothing": 1,
         "tickmode": "linear",
         "tick0": 1e-7,
         "dtick": 2e-7,
@@ -119,7 +114,6 @@
         "title": "pressure, p, Pa",
         "ticksuffix": "Pa",
         "tickformat": ".3s",
-        "smoothing": 1,
         "tickmode": "linear",
         "tick0": 100000,
         "dtick": 200000,
@@ -187,7 +181,6 @@
         "title": "length, l, m",
         "ticksuffix": "m",
         "tickformat": ".3s",
-        "smoothing": 1,
         "tickmode": "array",
         "arraytick0": 1,
         "arraydtick": 2,
@@ -199,7 +192,6 @@
         "title": "pressure, p, Pa",
         "ticksuffix": "Pa",
         "tickformat": ".3s",
-        "smoothing": 1,
         "tickmode": "array",
         "arraytick0": 2,
         "arraydtick": 4,