[Fix] Core 修复 BasicBotCode 中 'contentToString()' 格式错误的问题;

[Fix] BasicBotCode 修复 'contentToString()' 尾部缺少方括号的问题;

ContentGrabbingJi-core/src/main/java/net/lamgc/cgj/bot/framework/base/BasicBotCode.java

@@ -66,7 +66,7 @@ public class BasicBotCode extends AbstractBotCode {
                     throw new IllegalStateException(e);
                 }
             }
-            return builder.deleteCharAt(builder.lastIndexOf("&")).toString();
+            return builder.deleteCharAt(builder.lastIndexOf("&")).append(']').toString();
         }
     }