Fix remaining compiler warnings in the thunar code.

thunar/thunar-dbus-service.c

thunar/thunar-exec.c

thunar/thunar-io-jobs-util.c

thunar/thunar-io-scan-directory.c

thunar/thunar-list-model.c

thunar/thunar-location-button.c

thunar/thunar-path-entry.c

thunar/thunar-renamer-dialog.c

thunar/thunar-renamer-model.c

thunar/thunar-shortcuts-view.c

thunar/thunar-simple-job.c

thunar/thunar-standard-view.c

thunar/thunar-thumbnailer.c

thunar/thunar-view.c

thunar/thunar-window.c

thunar/xfce-heading.c

thunar/xfce-titled-dialog.c