Viewport camera won't rotate when pressing right mouse click while using a Wacom Tablet and Pen.

### Tested versions

This is reproducible in any project in any version of godot.

### System information

Windows 11 - Godot Engine v4.3.stable.official

### Issue description

Viewport camera won't rotate when pressing right mouse click while using a Wacom Tablet and Pen. The right mouse button has to be configured to one of the pen buttons to test this.

When using a mouse the viewport camera rotates when pressing and moving a mouse. So it should have the same behavior when using a tablet for navigating.

This is quite a bummer for artists that use devices like Wacom tablet for pretty much any kind of work of navigation using a computer.

This is reproducible in any project in any version of godot.

### Steps to reproduce

The right mouse button has to be configured to one of the pen buttons to test this.

When using a mouse the viewport camera rotates when pressing and moving a mouse. But won't work the same way with a pen and tablet.

### Minimal reproduction project (MRP)

This is reproducible in any project in any version of godot.

Reproduce the issue in the Godot editor on Windows 11 using a Wacom tablet with the right mouse button assigned to a pen button, then compare viewport camera navigation with a mouse. Done means pressing and moving with the pen button rotates the viewport camera as mouse input does; no source file or test is identified in the issue.

Written by the indexing model from the issue text.