Added default setting for 'Disable encoding while previewing' in advanced

In the current v0.52.04 test build if you check 'disable encoding while previewing' in advanced and then hit the 'Defaults' button, nothing happens. It does not uncheck that option like it should (as it is turned off by default). Fixed with this line.

There are some empty commits in this request, not sure why they are there. I'm still learning this github thing so I apologize for that mess.