Update to prevent warnings with WP_DEBUG on

Hey Ron/Andrea,

We (The CTLT team at UBC) recently began updating all of our plugins to ensure they have no warnings when WP_DEBUG is turned on. We noticed that this plugin was causing a couple, so we went ahead and fixed them.

They’re relatively minor, but have gone ahead and threw them up on github (hopefully easier to see that way)

https://github.com/ubc/ra-network-privacy/commit/018d893a906fea6e0301d5abd8855abbde370345

Thanks for a great plugin!

https://www.ads-software.com/plugins/network-privacy/