Set the aces value in the tone-mapping item

[rsax]

The “aces” option in the tone mapping selector of the editor is missing a specified value.

[google-cla]

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[elalish]

Good catch, thank you! Would you mind signing the CLA? Should be automatic for an individual.

[elalish]

@googlebot I fixed it.

[elalish]

@rsax did you have any trouble signing the CLA? I can't take your code until you do. It's by the email associated with your commit: @rsax <rs*****al​@plasmout.com>.

[rsax]

You’re right, I signed with a different email. Please revalidate.