Fjord, Westeros and Porygon Themes - Button icons are missing in Widget configuration and DDM Form Builder

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: Master
• Fix Version/s: 7.2.X, 7.2.1 CE GA2, Master
• Component/s: Frontend Infrastructure, Themes > Fjord, Themes > Porygon, Themes > Westeros Bank
• Labels: None
• Branch Version/s:
  7.2.x
• Backported to Branch:
  Committed
• Fix Priority: 4
• Sprint: S03E03 - Mucugê
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/74688

Step to reproduce:

1. Add Fjord, Westeros or Porygon Themes
2. Add Widget Page
3. Add a Media Gallery widget to widget Page
4. Navigate to Configuration

Expected result:
The buttons under Show Media Type have arrows pointing to the direction the user can move a media type.

Actual result:
No arrows appear.

Tested also with DM and Blogs widgets.

Reproduced on:
Tomcat 9.0.17 + MySQL 5.7.
Portal master c0c13433600398fed8768f539aa8212978f7409c