fix(router/thetastar): Don't forget to rm. probe when there's shorter path already

This fixes a fatal race condition that made tht_de9_to_tht_de9 always
fail since 7eff7ad9f0a24a9688ab5235f01115f7c85b1ff4.

src/router/thetastar.rs

@@ -319,6 +319,12 @@ where
                                     // No need to add neighbors that we have already reached through a
                                     // shorter path than now.
                                     if *entry.get() <= next_score {
+                                        // We just remove the probe instantly
+                                        // here instead of doing it in
+                                        // ThetastarState::Probing or a new
+                                        // state to avoid complicating.
+                                        strategy.remove_probe(&self.graph);
+
                                         self.state = ThetastarState::VisitingProbeOnNavedge(
                                             visited_navnode,
                                             curr_navedge,