Wrap fullscreen.css with @media rule

[mtrebron]

https://github.com/plone/plone.staticresources/blob/master/src/plone/staticresources/static/plone-fullscreen/fullscreen.css

The :fullscreen pseudo-selector does not apply to printed media. The whole stylesheet can be wrapped with

@media screen {
  [..]
}

[revaarathore11]

@gforcada @mauritsvanrees please assign me.