The default exception for iris is outdated

[LeoLuxo]

In newer versions of the Iris mod (less than 3 months old), the new package name is net.irisshader.iris, instead of the old net.coderbot.iris.

The default GUI exceptions for blurring, notably the ShaderScreen, should be updated to net.irisshader.iris, as currently it is broken when using recent versions of Iris.