input: Rename weston_device_repick() to weston_seat_repick()

Old left-over misnaming.
diff --git a/src/compositor.h b/src/compositor.h
index 6dc9e63..a295ded 100644
--- a/src/compositor.h
+++ b/src/compositor.h
@@ -1017,7 +1017,7 @@
 void
 weston_seat_init_touch(struct weston_seat *seat);
 void
-weston_device_repick(struct weston_seat *seat);
+weston_seat_repick(struct weston_seat *seat);
 
 void
 weston_seat_release(struct weston_seat *seat);