x11: Fix cname of Screen methods
x11: Fix cname of Screen methods

Distrotech/vala,flobrosch/vala-fixes,spidermonkdust/vala,tjol/vala-tjol,xdave/pvala,kamanashisroy/aroop,Distrotech/vala,spidermonkdust/vala,GNOME/vala,Distrotech/vala,jessevdk/vala,frida/vala,tjol/vala-tjol,severinh/vala,flobrosch/vala-fixes,GNOME/vala,frida/vala,playya/vala,GNOME/vala,severinh/vala,frida/vala,tjol/vala-tjol,kamanashisroy/aroop,rvu95/vala,playya/vala,frida/vala,jessevdk/vala,GNOME/vala,frida/vala,rvu95/vala,flobrosch/vala-fixes,spidermonkdust/vala,severinh/vala,kamanashisroy/aroop,jessevdk/vala,rvu95/vala,playya/vala