make mathquill pass jslint

Change-Id: I30fc725fcc02d29c1edf05120358edc9eb178e96
Reviewed-on: https://gerrit.instructure.com/10620
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Jon Jensen <jon@instructure.com>

Author: ryankshaw

public/javascripts/mathquill.js

@@ -1856,7 +1856,7 @@ define([
   LatexCmds['∑'] = LatexCmds.sum = LatexCmds.summation = bind(BigSymbol,'\\sum ','∑');
   LatexCmds['∏'] = LatexCmds.prod = LatexCmds.product = bind(BigSymbol,'\\prod ','∏');
   LatexCmds.coprod = LatexCmds.coproduct = bind(BigSymbol,'\\coprod ','∐');
-  LatexCmds['∫'] = LatexCmds.int = LatexCmds.integral = bind(BigSymbol,'\\int ','∫');
+  LatexCmds['∫'] = LatexCmds['int'] = LatexCmds.integral = bind(BigSymbol,'\\int ','∫');