set n=4 for kaleido

Author: emilykl

test/image/make_baseline.py

@@ -94,7 +94,7 @@ async def make_baselines_async():
     if mathjax is not None:
         kopts['mathjax'] = mathjax
 
-    async with kaleido.Kaleido(n=1, **kopts) as k:
+    async with kaleido.Kaleido(n=4, **kopts) as k:
         for name in allNames:
             outName = name
             if mathjax_version == 3: