Remove deserialization from black belt

Author: paul-ion

trainingportal/static/lessons/blackBelt/definitions.json

@@ -129,15 +129,6 @@
                 "solution":"cwe134.sol.md",
                 "codeBlockIds":["safeMemoryManagement","inputAllowListing"]
             },
-            {
-                "id":"cwe502",
-                "name":"Deserialization of Untrusted Data",
-                "playLink":"/cwe502.jsp",
-                "description": "cwe502.html",
-                "attackGram":"deserialization.png",
-                "solution":"cwe502.sol.md",
-                "codeBlockIds":["enforceSafeDeserialization"]
-            },
             {
                 "id":"quiz",
                 "name":"Quiz",