Add mantid help email link to help menu

[jhaigh0]

Description of work

Added mailto:[email protected] link to the Help menu.

There is no associated issue.

To test:

• Click Help->Email [email protected]
• It should open a new email in your default email program

If it's not working, using this page to test mailto links
https://www.scottseverance.us/mailto.html

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Reviewer

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Functional Tests

• Do changes function as described? Add comments below that describe the tests performed?
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[robertapplin]

A simple but useful change that works as expected 👍