Broken "Ignore Older" setting in in_tail plugin

[Lumiond]

Bug Report

Describe the bug
"Ignore older" setting doesn't work at runtime, only at start, after version 2.1.8.

To Reproduce

• Steps to reproduce the problem:

1. Set in_tail plugin to collect logs with Ignore_Older=1h
2. Start fluent-bit

Expected behavior
After 2h of work Fluent-bit keeps open only current file and file from previous hour.

Screenshots

Your Environment

• Version used: 3.0.6
• Configuration: build from source with kafka out plugin
• Operating System and version: windows server 2019

Additional context
I noticed that Fluentbit doesn't release old log files, so I used the "Ignore older" setting to reduce the number of open files, because when I have around 1000 logs per 24h, Fluent-Bit uses a lot of RAM (more than 1 GB, which is a lot for an agent). Unfortunately I can't reduce the number of log files. After v2.1.8, this setting doesn't work at runtime.