fix: changed utcTime(utcTimeES) select option default value.

[fukusuket]

Hello, thanks for the excellent tool :) I tried adding a fix that leads to an improvement in the error message.

What Changed

• changed Upload Event Log File : Time zone select option default value Username to Time Zone
  • to make the input check work correctly.

Motivation and Context

When user does not set Time Zone, the error message is as follows.(Upload failed!)

It seems that in this case an error message is expected that Please set the time zone of the event logs. as follows.

• https://github.com/JPCERTCC/LogonTracer/blob/v1.5.4/static/js/script.js#L1553-L1554
• https://github.com/JPCERTCC/LogonTracer/blob/v1.5.4/static/js/script.js#L1599-L1600

but, the default value for the Time Zone select option was Username as follows.

• https://github.com/JPCERTCC/LogonTracer/blob/v1.5.4/templates/index.html#L451
• https://github.com/JPCERTCC/LogonTracer/blob/v1.5.4/templates/index.html#L458

So I changed the default value in this PR.

Evidence

After fixing it, I confirmed that the error message is as follows.(Please set the time zone of the event logs.)

and I confirmed that uploading can be performed normally when Time Zone value is set.

I would appreciate it if you could confirm it🙏

[shu-tom]

Thanks for your pull request!

[fukusuket]

Thank you for your quick review :)