Data_Engine: Fix typo in DomainTree creation

[vietle-bh]

Issues addressed by this PR

Closes #3317

The existing code does (min + min)/2 which I've rectified to (min + max)/2.

Test files

It's just a typo so hopefully someone who worked on Domain Tree before can approve right away 😉

Changelog

Additional comments

[vietle-bh]

@BHoMBot check required

[bhombot-ci]

@vietle-bh to confirm, the following actions are now queued:

• check code-compliance
• check documentation-compliance
• check project-compliance
• check core
• check null-handling
• check serialisation
• check versioning
• check installer

There are 20 requests in the queue ahead of you.

[FraserGreenroyd]

Approving on code review and historical review here which shows that using min - max was put in to other areas which does suggest this is a typo bug.

[FraserGreenroyd]

@BHoMBot check copyright-compliance
@BHoMBot check dataset-compliance
@BHoMBot check unit-tests
@BHoMBot check ready-to-merge

[bhombot-ci]

@FraserGreenroyd to confirm, the following actions are now queued:

• check copyright-compliance
• check dataset-compliance
• check unit-tests
• check ready-to-merge

There are 8 requests in the queue ahead of you.

[FraserGreenroyd]

@BHoMBot this is a DevOps instruction. I am requesting neutral checks on: unit-tests

[bhombot-ci]

@FraserGreenroyd I have provided neutral checks to the checks requested. These checks will need to be run properly to obtain full results.

[FraserGreenroyd]

@vietle-bh just a gentle reminder to include which engine is primarily affected by a PR to the BHoM_Engine repository in the title - I've added Data_Engine for this one 😄 just helps our automated change log processes