Codechange: Skip non-water water region patches in neigbor search

(cherry picked from commit 8a1cea2ab6)

src/pathfinder/yapf/yapf_ship_regions.cpp

@@ -103,6 +103,7 @@ private:
 public:
 	void AddOrigin(const WaterRegionPatchDesc &water_region_patch)
 	{
+		if (water_region_patch.label == INVALID_WATER_REGION_PATCH) return;
 		if (!HasOrigin(water_region_patch)) m_origin_keys.push_back(CYapfRegionPatchNodeKey{ water_region_patch });
 	}