rename $(M) to $(MOTOR_PV) in the mymotor.opi screen's quick diagnost…

[rerpha]

…ics section to avoid conflicts with outer OPIs also using $(M)

Description of work

See title of PR.

See IMAT for proof this works, and point client at other instruments to make sure this still works

Ticket

None

Acceptance criteria

List the acceptance criteria for the PR. The aim is provide information to help the reviewer

Unit tests

Give an overview of unit tests you have added or modified, if applicable. The aim is provide information to help the reviewer

System tests

Mention any automated tests or manual tests that you have added or modified, if applicable. The aim is provide information to help the reviewer

Documentation

Highlight and provide a link to any additions or changes to the documentation, if applicable. The aim is provide information to help the reviewer

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Code Review

• Is the code of an acceptable quality?
• If the change is to an OPI, does the check_opi_format.py script in C:\Instrument\Dev\ibex_gui\base\uk.ac.stfc.isis.ibex.opis pass?
• Do the changes function as described and is it robust?
• Is there associated PR for the release notes?

Final Steps

• Reviewer has also merged the release notes