D-Bus: Fix parameters in signal wrappers
D-Bus: Fix parameters in signal wrappers

severinh/vala,spidermonkdust/vala,tjol/vala-tjol,frida/vala,playya/vala,jessevdk/vala,severinh/vala,tjol/vala-tjol,rvu95/vala,frida/vala,Jc2k/vala,GNOME/vala,lovebug356/vala,spidermonkdust/vala,GNOME/vala,Distrotech/vala,frida/vala,jessevdk/vala,flobrosch/vala-fixes,frida/vala,frida/vala,GNOME/vala,xdave/pvala,themiwi/vala,lovebug356/vala,rvu95/vala,kamanashisroy/aroop,Distrotech/vala,themiwi/vala,themiwi/vala,severinh/vala,playya/vala,kamanashisroy/aroop,spidermonkdust/vala,phako/vala,flobrosch/vala-fixes,playya/vala,jessevdk/vala,GNOME/vala,flobrosch/vala-fixes,phako/vala,rvu95/vala,kamanashisroy/aroop,Jc2k/vala,Distrotech/vala,tjol/vala-tjol