VAA group added a wrong level in URE's "Custom Capabilities" UI

[pbiron]

Describe the bug

Since VAA 1.6.4 when the URE integration was added, the VAA node in URE's "Custom capabilities" UI is added at the wrong "level". It is added at level 3 and should be added at level 2.

Steps to reproduce the behavior:

1. Install Activate at least 1 plugin (in addition to VAA) that also hooks into URE's ure_capabilities_groups_tree filter. One such plugin is Query Monitor.
2. Go to Users
3. Click on the Capabilities row action for some user
4. See that VAA's "URE group" is displayed as a grandchild of URE's "Custom capabilities" node in the UI (see screenshot below). This makes it look like the VAA custom capabilities are somehow related to some other plugin.

Expected behavior

VAA's group should display as a direct child of URE's "Custom capabilities".

Screenshots

Specifications

• Plugin Version: 1.8.9
• WordPress Version: 6.6.1
• Other plugins installed: many, including Query Monitor 3.16.4
• Theme: any
• Browser: Chrome 127.0.6533.72 (Official Build) (64-bit)

Additional context

PR coming shortly (with a screenshot after the PR applied)