Alert `[h4]` tags are no longer styled correctly

[Sierra "SierraKomodo" Brown]

Description of issue

The [h4][/h4] tags in alert boxes are no longer styling into the title bars on the left. This appears to only be affecting the GalaxyAnvil theme, and still works with the inline theme.

Difference between expected and actual behavior

The tags should be styled into the title bar on the left of the alerts as shown below:

Steps to reproduce

1. Create an alert box that includes a [h4]Title[/h4] tag, example:

[container:alert alert-primary]
    [h4]TITLE[/h4]
    [p]Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aliquam dictum mi elementum, volutpat lacus non, faucibus arcu.[/p]
[/container]

Link(s) to affected pages/worlds

Broken: https://www.worldanvil.com/w/galaxyanvil-sierrakomodo/a/monochrome-blue-article
Functioning: https://www.worldanvil.com/w/galaxies-end-sierrakomodo/a/theme-preview---midnight-dusk-article

Length of time in which bug has been known to occur

Noted today