Java: Minor model fix.

Author: aschackmull

java/ql/src/semmle/code/java/frameworks/jackson/JacksonSerializability.qll

@@ -280,6 +280,7 @@ private class JacksonModel extends SummaryModelCsv {
     row =
       [
         "com.fasterxml.jackson.databind;ObjectMapper;true;valueToTree;;;Argument[0];ReturnValue;taint",
+        "com.fasterxml.jackson.databind;ObjectMapper;true;valueToTree;;;MapValue of Argument[0];ReturnValue;taint",
         "com.fasterxml.jackson.databind;ObjectMapper;true;convertValue;;;Argument[0];ReturnValue;taint"
       ]
   }