Fix falsepositives list

rules/windows/powershell/powershell_CL_Invocation_LOLScript.yml

@@ -4,6 +4,7 @@ description: Detects Execution via SyncInvoke in CL_Invocation.ps1 module
 status: experimental
 author: oscd.community, Natalia Shornikova
 date: 2020/10/14
+modified: 2021/05/21
 references:
     - https://github.com/LOLBAS-Project/LOLBAS/blob/master/yml/OSScripts/Cl_invocation.yml
     - https://twitter.com/bohops/status/948061991012327424
@@ -20,5 +21,6 @@ detection:
           - 'CL_Invocation.ps1'
           - 'SyncInvoke'
     condition: selection
-falsepositives: Unknown
+falsepositives:
+    - Unknown
 level: high