[FS#548] firewall3: Timezone problems, UTC used always despite UTC Time not checked

[LEDE Bugs]

The following task has a new comment added:

FS#548 - firewall3: Timezone problems, UTC used always despite UTC Time not checked
User who did this - Jo-Philipp Wich (jow-)

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Fix to firewall3.git pushed with https://git.lede-project.org/82ccd9e
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=548#comment1943