girparser: Fix adding Cancellable as last parameter
girparser: Fix adding Cancellable as last parameter

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