Prevent crash when placing TrollsteinnBlock on dedicated server (#2484)

Author: sbite0138

src/main/java/twilightforest/block/TrollsteinnBlock.java

@@ -47,7 +47,7 @@ public TrollsteinnBlock(Properties properties) {
 	/**
 	 * Computation from vanilla function updateSkyBrightness in Level.java
 	 */
-	public static int calculateServerSkyDarken(ClientLevel level) {
+	public static int calculateServerSkyDarken(Level level) {
 		double rainEffect = 1.0 - (double) (level.getRainLevel(1.0F) * 5.0F) / 16.0;
 		double thunderEffect = 1.0 - (double) (level.getThunderLevel(1.0F) * 5.0F) / 16.0;
 		double dayCycleEffect = 0.5 + 2.0 * Mth.clamp(Mth.cos(level.getTimeOfDay(1.0F) * (float) (Math.PI * 2)), -0.25, 0.25);
@@ -88,7 +88,8 @@ public BlockState getStateForPlacement(BlockPlaceContext ctx) {
 		for (Map.Entry<Direction, BooleanProperty> e : PROPERTY_MAP.entrySet()) {
 			Level level = ctx.getLevel();
 			BlockPos pos = ctx.getClickedPos();
-			int light = level.getMaxLocalRawBrightness(pos.relative(e.getKey()), level instanceof ClientLevel clientLevel ? calculateServerSkyDarken(clientLevel) : level.getSkyDarken());
+			int light = level.getMaxLocalRawBrightness(pos.relative(e.getKey()),
+				level.isClientSide() ? calculateServerSkyDarken(level) : level.getSkyDarken());
 			ret = ret.setValue(e.getValue(), light > LIGHT_THRESHOLD);
 		}
 		return ret;