updates loock-back value for 'expectedExportedRule'

Author: MadameSheema

x-pack/plugins/security_solution/cypress/objects/rule.ts

@@ -382,5 +382,5 @@ export const getEditedRule = (): CustomRule => ({
 export const expectedExportedRule = (ruleResponse: Cypress.Response): string => {
   const jsonrule = ruleResponse.body;
 
-  return `{"id":"${jsonrule.id}","updated_at":"${jsonrule.updated_at}","updated_by":"elastic","created_at":"${jsonrule.created_at}","created_by":"elastic","name":"${jsonrule.name}","tags":[],"interval":"100m","enabled":false,"description":"${jsonrule.description}","risk_score":${jsonrule.risk_score},"severity":"${jsonrule.severity}","output_index":".siem-signals-default","author":[],"false_positives":[],"from":"now-17520h","rule_id":"rule_testing","max_signals":100,"risk_score_mapping":[],"severity_mapping":[],"threat":[],"to":"now","references":[],"version":1,"exceptions_list":[],"immutable":false,"type":"query","language":"kuery","index":["exceptions-*"],"query":"${jsonrule.query}","throttle":"no_actions","actions":[]}\n{"exported_count":1,"missing_rules":[],"missing_rules_count":0}\n`;
+  return `{"id":"${jsonrule.id}","updated_at":"${jsonrule.updated_at}","updated_by":"elastic","created_at":"${jsonrule.created_at}","created_by":"elastic","name":"${jsonrule.name}","tags":[],"interval":"100m","enabled":false,"description":"${jsonrule.description}","risk_score":${jsonrule.risk_score},"severity":"${jsonrule.severity}","output_index":".siem-signals-default","author":[],"false_positives":[],"from":"now-50000h","rule_id":"rule_testing","max_signals":100,"risk_score_mapping":[],"severity_mapping":[],"threat":[],"to":"now","references":[],"version":1,"exceptions_list":[],"immutable":false,"type":"query","language":"kuery","index":["exceptions-*"],"query":"${jsonrule.query}","throttle":"no_actions","actions":[]}\n{"exported_count":1,"missing_rules":[],"missing_rules_count":0}\n`;
 };