nsDeleteZone: Fix zone deletion process

fn/ns.php

@@ -58,18 +58,14 @@ function nsCheckZonePossession($zone) {
 }
 
 function nsDeleteZone($zone) {
-	// Remove from Knot configuration
-	knotcConfExec(["unset 'zone[$zone]'"]);
-
-	// Remove Knot zone file
-	if (unlink(CONF['ns']['knot_zones_path'] . '/' . $zone . 'zone') !== true)
-		output(500, 'Failed to remove Knot zone file.');
-
-	// Remove Knot related data
+	// Delete zone data
 	exec(CONF['dns']['knotc_path'] . ' --force zone-purge ' . $zone, result_code: $code);
 	if ($code !== 0)
 		output(500, 'Failed to purge zone data.');
 
+	// Remove from Knot configuration
+	knotcConfExec(["unset 'zone[$zone]'"]);
+
 	// Remove from database
 	query('delete', 'zones', [
 		'zone' => $zone,