Update definitions_craterlake.xml

[mposik1983]

update forward mpgd disk inner radii

Briefly, what does this PR introduce?

Increases the inner radii of the forward MPGD disks to 9cm as described in the geometry table:https://eic.jlab.org/Geometry/Detector/Detector-20240515102931.html

What kind of change does this PR introduce?

• [ ] Bug fix (issue #__)
• [ ] New feature (issue #__)
• [ ] Documentation update
• [x] Other:

Please check if this PR fulfills the following:

• [ ] Tests for the changes have been added
• [ ] Documentation has been added / updated
• [ x] Changes have been communicated to collaborators

Does this PR introduce breaking changes? What changes might users need to make to their code?

none

Does this PR change default behavior?

no