Monitor: Do not open monitor notification preferences in new tab

[ebinnion]

Changes proposed in this Pull Request:

• Removes target property so that downtime monitoring notification settings opens in same tab

Jetpack product discussion

• [EPIC] Jetpack and Nav Unification v1 prelaunch flow fixes wp-calypso#50225
• p1HpG7-bcl-p2

Does this pull request change what data or activity we track or use?

No

Testing instructions:

• Checkout patch
• On a connected Jetpack site, go to Security tab
• Click "Configure your notification settings" card and verify that the settings tab does not open in new page

Proposed changelog entry for your changes:

• Opens downtime monitoring notification settings in same tab

[github-actions]

Thank you for your PR!

When contributing to Jetpack, we have a few suggestions that can help us test and review your patch:

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• ✅ Add a "[Status]" label (In Progress, Needs Team Review, ...).
  
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jetpack plugin:

• Next scheduled release: March 2, 2021.
• Scheduled code freeze: February 22, 2021

[jeherve]

Cherry-picked to jetpack/branch-9.5 in 17620cb