Small changes to MITRE technique names

[d3vzer0]

During the integration of metta with my simulation platform I noticed that there are several metta config files that have the incorrect mitre_attack_technique mapping to the actual MITRE technique name. Perhaps MITRE made small changes to their model :) It involves the following differences (ie. wrong mitre_attack_technique vs correct mitre names):

mitre_attack_technique: System Owner-User Discovery
mitre: System Owner/User Discovery

mitre_attack_technique: Registry Run Keys / Start Folder
mitre: Registry Run Keys / Startup Folder

mitre_attack_technique: Lateral Movement with SSH Agent Hijacking
mitre: SSH Hijacking

mitre_attack_technique: Powershell
mitre: PowerShell

mitre_attack_technique: Cron Job
mitre: Local Job Scheduling