Ensure second parameter in gmdate is int, not float #17365

see https://forum.matomo.org/t/problem-with-the-two-factor-authentication-setting/41128/12?

WARNING: /Piwik/core/Cookie.php(155): Warning - gmdate() expects parameter 2 to be int, float given - Matomo 4.1.1 - Please report this message in the Matomo forums: https://forum.matomo.org (please do a search first as it might have been reported already) (Module: UsersManager, Action: setIgnoreCookie, In CLI mode: false)

Review

• [ ] Functional review done
• [ ] Potential edge cases thought about (behavior of the code with strange input, with strange internal state or possible interactions with other Matomo subsystems)
• [ ] Usability review done (is anything maybe unclear or think about anything that would cause people to reach out to support)
• [ ] Security review done see checklist
• [ ] Code review done
• [ ] Tests were added if useful/possible
• [ ] Reviewed for breaking changes
• [ ] Developer changelog updated if needed
• [ ] Documentation added if needed
• [ ] Existing documentation updated if needed