input: Rename weston_device_repick() to weston_seat_repick()

Old left-over misnaming.
diff --git a/src/compositor.c b/src/compositor.c
index 4252f37..280faa0 100644
--- a/src/compositor.c
+++ b/src/compositor.c
@@ -933,7 +933,7 @@
 		return;
 
 	wl_list_for_each(seat, &compositor->seat_list, link)
-		weston_device_repick(seat);
+		weston_seat_repick(seat);
 }
 
 WL_EXPORT void