Keep approve status when updating style

[Xpirix]

• The current PR is for the issue Approve styles by author when updating #321

Change summary:

• When updating a style, the status of approbation will be kept.
• If a style has been already approved, the updated version will be automatically approved:

• If a style is still in review, the updated version will also still be in review:

[dimasciput]

Thanks, @Xpirix. I'm going to merge this one, even though this new workflow could introduce issues and go against best practices

[Xpirix]

Thank you @dimasciput . You're right, this new workflow needs to be discussed further.