Fix flywheel battery not marking chunk dirty when energy level changes

src/main/kotlin/ru/dbotthepony/mc/otm/block/entity/tech/FlywheelBatteryBlockEntity.kt

@@ -37,6 +37,13 @@ class FlywheelBatteryBlockEntity(blockPos: BlockPos, blockState: BlockState) : M
 	private var multiblock: ShapedMultiblock? = null
 	private var lastHeight = -1
 	var batteryLevel = Decimal.ZERO
+		set(value) {
+			if (field != value) {
+				field = value
+				markDirtyFast()
+			}
+		}
+
 	private var cachedChargeEfficiency = Decimal.ONE
 
 	val formed: Boolean