Fix incorrect mapping in mixpanel destination

[spjtls9]

A summary of your pull request, including the what change you're making and why.

• width and height were incorrectly mapped to screen field.
• Fix the error: width -> screen.width; height -> screen.height

Testing

Include any additional information about the testing you have completed to ensure your changes behave as expected. For a speedy review, please check any of the tasks you completed below during your testing.

• [ ] Added unit tests for new functionality
• [ ] Tested end-to-end using the local server
• [ ] [If destination is already live] Tested for backward compatibility of destination. Note: New required fields are a breaking change.
• [ ] [Segmenters] Tested in the staging environment
• [ ] [Segmenters] [If applicable for this change] Tested for regression with Hadron.

[spjtls9]

Hi @brennan -- I see you added a tag 2 weeks ago. Is there anything you need from me to move this forward?

[joe-ayoub-segment]

Hi @spjtls9 apologies for the delay getting to this PR. I've been on extended leave but am back now.

Is this something you'd still like to deploy?

Kind regards, Joe

[spjtls9]

Hi @spjtls9 apologies for the delay getting to this PR. I've been on extended leave but am back now.

Is this something you'd still like to deploy?

Kind regards, Joe

yes, I would still like to deploy this change.

[joe-ayoub-segment]

Thanks for confirming @spjtls9 . It will go out with the next deploy.

[joe-ayoub-segment]

Thanks for confirming @spjtls9 . It will go out with the next deploy.

[spjtls9]

@joe-ayoub-segment sorry forgot about the process here.

Will this PR automatically merge when the deploy happens?

[joe-ayoub-segment]

Hi @spjtls9 I'll merge the PR just before we run the deploy.

[joe-ayoub-segment]

hi @spjtls9 PR deployed. Please confirm you are happy with the change.

[spjtls9]

hi @spjtls9 PR deployed. Please confirm you are happy with the change.

confirmed changes look good on my segment workspace. Thank you