Update MFR.json

[GunGuyAlex]

Updated the Name of the tracon

It said Medford Approach and it should be Cascade Approach

Description

Medford -> Cascade

Motivation and Context

So it is displayed properly.

How to prove the effect of this PR?

N/A

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Additional info

Is this a breaking change?

I hope not

• Breaking change (fix or feature that would cause existing functionality to not work as expected)
  No

Checklist

• [x ] My change or addition follow the formatting standard of the project.
• I am on the list of approved contributors.
  Not yet