MSAA 4x not working with custom render pipeline

## Bevy version

0.7

## Operating system & version

Windows 10

## What you did

I created a custom render pipeline similar to https://github.com/bevyengine/bevy/blob/main/examples/shader/shader_defs.rs

## What you expected to happen

When I use

App::new()
.insert_resource(Msaa { samples: 4 })
.add_plugins(DefaultPlugins)

multisampling must be added

## What actually happened

The margins as bad like no MSAA was ever applied

## Additional information