remove reg-import from optimize lockscreen

scripts/optimize-lockscreen.ps1

@@ -2,16 +2,10 @@
 # This script disables the new lock screen and login screen background
 # image.
 
-Import-Module -DisableNameChecking $PSScriptRoot\..\lib\reg-helper.psm1
-
 echo "Disabling login screen background image"
-Import-Registry(@"
-[HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\System]
-"DisableLogonBackgroundImage"=dword:00000001
-"@)
+mkdir -Force "HKLM:\Software\Policies\Microsoft\Windows\System"
+sp "HKLM:\Software\Policies\Microsoft\Windows\System" "DisableLogonBackgroundImage" 1
 
 echo "Disabling new lock screen"
-Import-Registry(@"
-[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\Personalization]
-"NoLockScreen"=dword:00000001
-"@)
+mkdir -Force "HKLM:\SOFTWARE\Policies\Microsoft\Windows\Personalization"
+sp "HKLM:\SOFTWARE\Policies\Microsoft\Windows\Personalization" "NoLockScreen" 1