fix ubjson uncompression error

Author: fangq

loadubjson.m

@@ -133,7 +133,7 @@
         parse_char('}');
     end
     if(isstruct(object))
-        object=struct2jdata(object,'Base64',0);
+        object=struct2jdata(object,struct('Base64',0));
     end
 
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