Fix redrawing of bridge signals more than 2 middle signals need updating

On exit signal aspect change, with 5+ aspect signalling

src/signal.cpp

@@ -1244,10 +1244,11 @@ static void RefreshBridgeOnExitAspectChange(TileIndex entrance, TileIndex exit)
 	const TileIndexDiffC offset = TileIndexDiffCByDiagDir(GetTunnelBridgeDirection(entrance));
 	const TileIndexDiff diff = TileDiffXY(offset.x * simulated_wormhole_signals, offset.y * simulated_wormhole_signals);
 	const uint signal_count = bridge_length / simulated_wormhole_signals;
-	TileIndex tile = entrance;
-	for (uint i = signal_count; i > 0; i--) {
-		tile += diff;
-		if (i <= 2) MarkTileDirtyByTile(tile, VMDF_NOT_MAP_MODE);
+	TileIndex tile = entrance + ((int)signal_count * diff);
+	const uint redraw_count = std::min<uint>(_extra_aspects, signal_count);
+	for (uint i = 0; i < redraw_count; i++) {
+		MarkTileDirtyByTile(tile, VMDF_NOT_MAP_MODE);
+		tile -= diff;
 	}
 }