Widen the axes margin and fix the clipped y label of Fig. 8

The BERT study spans less than one decade, so its log axis carried the
wide "6 x 10^-1" tick labels, which pushed the y label off the canvas.
Give that axis plain decimal ticks and widen the axes margin of every
result figure by the same amount, which keeps the axes box identical
across figures at the 4:3 ratio.

c19_mnist_epoch.py

@@ -209,7 +209,7 @@ def main():
                          "xtick.minor.width": 0.8, "ytick.minor.width": 0.8,
                          "xtick.major.size": 4.5, "ytick.major.size": 4.5})
     fig = plt.figure(figsize=(5.2, 3.9))
-    ax = fig.add_axes([0.155, 0.145, 0.82, 0.82])
+    ax = fig.add_axes([0.185, 0.145, 0.79, 0.79])
     xgrid = sorted({int(r["step"]) for r in rows
                     if r["method"] == "semantic"})
     if "digital_genie" in floors: