Remove liferay-theme-es2015-hook dependency

• Type: Task
• Status: Closed
• Priority: Minor
• Resolution: Completed
• Affects Version/s: None
• Fix Version/s: 7.2.X, Master
• Component/s: Frontend Infrastructure
• Labels: None
• Branch Version/s:
  7.2.x
• Backported to Branch:
  Committed
• Epic/Theme:
  • FI_Technical_Debt
• Sprint: S03E10 - Aranda de Duero
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/79025

The Porygon theme is the only user of this module and we can rewrite the JS fairly trivially to work without it, which allows us to clean up some cruft.