EnchantCommand: Make enchantment name non case sensitive (CloudburstM…

…C#1892)

(cherry picked from commit f5f3c7d)

src/main/java/cn/nukkit/command/defaults/EnchantCommand.java

@@ -78,6 +78,7 @@ public boolean execute(CommandSender sender, String commandLabel, String[] args)
     }
 
     public int getIdByName(String value) throws NumberFormatException {
+        value = value.toLowerCase();
         switch (value) {
             case "protection":
                 return 0;