FIX: Upgrade crossings when the rail or road is upgraded

[THLeaderH]

Description of the patch
The attached patch fixes the issue that a crossing is not upgraded when the rail or the road of the crossing is upgraded.

Affected features of the patch
This patch affects construction of rails and roads.

Testing procedure

• The squirrel scenario test function "test_way_road_upgrade_crossing()" was updated to check if the crossing is properly upgraded.
• The following procedure succeeded with pak64.
  
  • Build the sand road.
  • Build the 55kph rail to build a crossing.
  • Upgrade the rail to the 120kph rail. Check that the speed limit for rail is 120kph, not 80kph.

[prissi]

Even with test case, thank you very much. Incorporated in r11016