Improve Fjord Theme Fragment fidelity when editing a Site

• Type: Story
• Status: In Review
• Priority: Minor
• Resolution: Unresolved
• Affects Version/s: None
• Fix Version/s: Master
• Component/s: Themes > Westeros Bank
• Labels: None
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/61193

When editing a site configured with the Fjord theme, the fragments hold very little fidelity to it since the theme css is not applied to the edit page.