XR Plug-in Management: Inconsistant "OpenXR" wording

Steps to reproduce:

1. Create a project
2. Go to "Edit" -> "Project Settings"
3. Select the "XR Plug-in Management" item
4. Observe how OpenXR is displayed in the "Plug-in Providers" list

Actual results: Open XR

Expected results: It should be "OpenXR"

Reproducible with versions: 4.5.4 (6000.5.0a9, 6000.6.0a1)

Tested on (OS): macOS - Tahoe 26.3.1