Checkboxes in plugin settings don't reflect defaults until first save

[danieltaylor]

After first installing this plugin, the settings show that Auto Provision and Permit WordPress login are disabled:

However, even if they are left unchecked, these options become checked after saving the plugin settings for the first time:

I have tested this in both Safari and Chrome and have experienced the same issue. It appears that true is the default setting for these options, so either the checkboxes should show up as checked by default, or those options should default to false. Strangely enough, it appears that the checkboxes are set to be checked by default, so I'm not sure what is causing them to appear otherwise.