3dtiles上传模型，校验floors.json文件是否存在bug修复

src/main/java/com/fdkankan/scene/service/impl/SceneProServiceImpl.java

@@ -792,7 +792,7 @@ public class SceneProServiceImpl extends ServiceImpl<ISceneProMapper, ScenePro>
 
         //检测文件
         String floorsJsonPath = meshPath + File.separator + "floors.json";
-        if(FileUtil.exist(floorsJsonPath)){
+        if(!FileUtil.exist(floorsJsonPath)){
             throw new BusinessException(ErrorCode.FAILURE_CODE_5068);
         }
         String floorsJsonStr = FileUtil.readUtf8String(floorsJsonPath);