Add a function for removing the RunOnce key

scripts/Windows/Scripts/PowerManagement.ps1

@@ -96,6 +96,21 @@ $null = New-Module {
         $key.Handle.Close();
     }
 
+    <#
+        .SYNOPSIS
+        Clears leftovers from past registrations.
+    #>
+    function Clear-SetupRegistration {
+        Edit-DefaultUserKey {
+            param(
+                [RegistryKey] $Key
+            )
+
+            $runOnceKey = Get-RunOnceKey $Key;
+            Remove-Item $runOnceKey.PSPath;
+        }
+    }
+
     <#
         .SYNOPSIS
         Sets the user to login automatically on boot.