Switching from TAA to MSAA breaks compositor effects

### Tested versions

4.3-beta3

### System information

Windows and Linux

### Issue description

Switching AA method from TAA to MSAA breaks compositor effects using color buffers.
While I understand this is intended and there's a toggle for `access_resolved_color`, i believe this should be on by default. It would be really finnicky if changing AA settings on a shipped game would suddenly cause all compositor effects that access the color buffer to break, since AA method is often something that changes between graphic settings.

### Steps to reproduce

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### Minimal reproduction project (MRP)

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Reproduce the issue in Godot 4.3-beta3 by switching from TAA to MSAA and using compositor effects that access color buffers. Start by tracing the `access_resolved_color` setting and determine whether it should default on; done means those effects continue working after the anti-aliasing method changes.

Written by the indexing model from the issue text.