The Cancel and Apply buttons aren't properly centered so they aren't fully shown in the "+ More Shapes" section

[ane-gabriela]

Steps to reproduce:

1. Create a new diagram or edit an existing one
2. In edit mode click on the "+ More Shapes" section in the left side panel

Actual results: The Cancel and Apply button aren't properly shown.

Environment: Windows 11, XWiki 15.10.10, Chrome 128, Diagram Application (Pro) version 1.21-rc-1

NOTE: Testing with XWiki 15.10.10 and Diagram Application (Pro) 1.20.6, the issue is not reproducing