wireguard: T4930: remove pylint W0611: unused import

[c-po]

Change summary

Remove unused imports

************* Module vyos.ifconfig.wireguard
python/vyos/ifconfig/wireguard.py:17:0: W0611: Unused import time (unused-import)
python/vyos/ifconfig/wireguard.py:19:0: W0611: Unused timedelta imported from datetime (unused-import)
python/vyos/ifconfig/wireguard.py:22:0: W0611: Unused size imported from hurry.filesize (unused-import)
python/vyos/ifconfig/wireguard.py:23:0: W0611: Unused alternative imported from hurry.filesize (unused-import)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Code style update (formatting, renaming)
• Refactoring (no functional changes)
• Migration from an old Vyatta component to vyos-1x, please link to related PR inside obsoleted component
• Other (please describe):

Related Task(s)

• https://vyos.dev/T4930

Related PR(s)

• T4930: Allow WireGuard peers via DNS hostname #4200

Checklist:

• I have read the CONTRIBUTING document
• I have linked this PR to one or more Phabricator Task(s)
• I have run the components SMOKETESTS if applicable
• My commit headlines contain a valid Task id
• My change requires a change to the documentation
• I have updated the documentation accordingly

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[github-actions]

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Details

CI logs

• CLI Smoketests (no interfaces) ❌ failed
• CLI Smoketests (interfaces only) 👍 passed
• Config tests 👍 passed
• RAID1 tests 👍 passed
• TPM tests 👍 passed