Always log an entry even when no changes are made

Update-StaffAD.ps1

@@ -106,6 +106,11 @@ foreach ($entry in $Deduped.Values) {
 # --- Summary ---
 Write-Log ""
 Write-Log "  --- Summary ---"
+
+if ($emailUpdates -eq 0 -and $disables -eq 0) {
+    Write-Log "  No changes were made on this run." "Cyan"
+}
+
 Write-Log "  Email updates       : $emailUpdates"
 Write-Log "  Accounts disabled   : $disables"
 Write-Log "  No changes needed   : $noChanges"