Set gamerule DO_INSOMNIA to false when creating islands.

plugin/src/main/java/com/alttd/cometskyblock/worldgenerator/MasterWorldGenerator.java

@@ -84,6 +84,7 @@ public class MasterWorldGenerator {
                     return;
                 }
                 newIsland.setDifficulty(Difficulty.EASY);
+                newIsland.setGameRule(GameRule.DO_INSOMNIA, false);
                 // TODO Load a schematic into this world?
                 // Currently random islands are generated by CometIslandGenerator()
                 plugin.getServer().getWorlds().add(newIsland);