Slide in hamburger menu in 'mobile view' only on touchscreen + mouse desktops

This makes it really hard to use mobile view on any device with a mouse, which is pretty annoying when developing. I moved this topic from Contribute > Bug to Development, since it doesn’t affect most people’s “normal use”.

I’m sure it didn’t used to be an issue. @featheredtoast any ideas? Maybe related to the ember upgrade?