fix: repair heidelberg test graph

The reduced travel time in the API test is because now the whole way rather than just its fragment is tagged with `footpath=crossing`. The crossing is necessary to pick up kerb height. Closes https://github.com/GIScience/openrouteservice/issues/1761

Author: aoles

ors-api/src/test/files/heidelberg.osm.gz

@@ -2100,7 +2100,7 @@ void testWheelchairKerbRestriction() {
                 .assertThat()
                 .body("any { it.key == 'routes' }", is(true))
                 .body("routes[0].summary.distance", is(74.1f))
-                .body("routes[0].summary.duration", is(57.9f))
+                .body("routes[0].summary.duration", is(49.2f))
                 .statusCode(200);
 
         restrictions = new JSONObject();