Change default entity selection to outline instead of cube gizmo

[RenzoraEngine]

Problem

Right now the default uses a cube boundary gizmo. I think outline has better UX and doesn't get in the way.

Proposed Solution

In the settings switch the default selection gizmo. The dropdown setting already exists, it's a matter of just changing it.

Area

Which part of the engine does this affect?

• Editor UI
• Rendering / Post-Processing
• Physics
• Scripting (Rhai)
• Blueprint Visual Scripting
• Animation
• Terrain
• Particles
• Scene Management
• Import / Export
• Audio
• 2D
• Runtime
• Other: ___

Additional Context