Fix rendering of lists in \left/\right

Test plan:
 - Make sure tests work
 - Make sure screenshots didn't change, and new screenshot looks good

Auditors: alpert

test/huxley/Huxleyfile.json

@@ -143,6 +143,12 @@
         "url": "http://localhost:7936/test/huxley/test.html?m=+\\left\\{\\rule{0.1em}{1em}\\right.x^{+\\left\\{\\rule{0.1em}{1em}\\right.x^{+\\left\\{\\rule{0.1em}{1em}\\right.}}"
     },
 
+    {
+        "name": "LeftRightListStyling",
+        "screenSize": [1024, 768],
+        "url": "http://localhost:7936/test/huxley/test.html?m=a+\\left(x+y\\right)-x"
+    },
+
     {
         "name": "PrimeSpacing",
         "screenSize": [1024, 768],

test/huxley/LeftRightListStyling.hux/record.json

@@ -0,0 +1,5 @@
+[
+  {
+    "action": "screenshot"
+  }
+]