Removed duplicated binding
Removed duplicated binding

The exact same code is present in the "super" method so this object was
being bound to the "change:enabled" event twice. This was causing the
dataview to fetch it's data twice when dataview was re-enabled.

splashblot/cartodb.js,splashblot/cartodb.js,splashblot/cartodb.js,splashblot/cartodb.js