Use spaces around optional parameter values

[deivid-rodriguez]

What was the end-user or developer problem that led to this PR?

Reviewing #8753 I'm seeing some unrelated style changes. I'd like to enforce a consistent style to get more focused PR diffs.

What is your fix for the problem, implemented in this PR?

Consistently use spaces around optional parameter values.

Make sure the following tasks are checked

• Describe the problem / feature
• Write tests for features and bug fixes
• Write code to solve the problem
• Make sure you follow the current code style and write meaningful commit messages without tags

[segiddins]

Please add this commit to the blame ignore list

[deivid-rodriguez]

I generally draw the line around 400-500 net change, but other prefer smaller commits to be kept in there too, so let me add it!