[UIFE][FFE] Add close button to spread mode

[Sam Spilsbury]

Hi All

We have a change that has gone into trunk which makes the titlebars of 
windows have only a clickable "close" button during spread mode.

The only thing that needs to be changed are screenshots of the spread 
mode, which a note that clicking on the close button closes the window.

(LP: #876017)

Cheers,

Sam