Remove Privilege escalation/T1504 in attack_schema

Shows it twice in ATT&CK matrix in the configuration,
but shows it only once in the ATT&CK matrix in the report section.

monkey/monkey_island/cc/services/attack/attack_schema.py

@@ -102,23 +102,6 @@ SCHEMA = {
                 }
             }
         },
-        "privilege_escalation": {
-            "title": "Privilege escalation",
-            "type": "object",
-            "link": "https://attack.mitre.org/tactics/TA0004/",
-            "properties": {
-                "T1504": {
-                    "title": "PowerShell profile",
-                    "type": "bool",
-                    "value": True,
-                    "necessary": False,
-                    "link": "https://attack.mitre.org/techniques/T1504",
-                    "description": "Adversaries may gain persistence and elevate privileges "
-                                   "in certain situations by abusing PowerShell profiles which "
-                                   "are scripts that run when PowerShell starts."
-                }
-            }
-        },
         "defence_evasion": {
             "title": "Defence evasion",
             "type": "object",