Tests: Fix upgrade test settings structure to mirror WPForms Lite 1.9.3.1+

Author: n7studios

tests/acceptance/general/UpgradePathsCest.php

@@ -110,6 +110,7 @@ public function testFormSettingsPrefixAddedToSettingsOnUpgrade(AcceptanceTester
 			'field_id'  => '0',
 			'settings'  => [
 				'store_spam_entries' => '0',
+				'submit_text'        => 'Submit',
 			],
 		];