[Linux] Do not set _STATE_HIDDEN
[Linux] Do not set _STATE_HIDDEN

According to EWMH, this is not supposed to be set by the application,
see http://standards.freedesktop.org/wm-spec/1.3/ar01s05.html.

zsx/r3,zsx/r3,zsx/r3,Pointillistic/rebol-lang,zsx/r3,Pointillistic/rebol-lang,Pointillistic/rebol-lang,Pointillistic/rebol-lang