Add field 'Fix Version' to the default screen for global mods.

This change is required for bots to be able to set a fixversion. The API is the only way to assign archived versions.

Read this for my issue: http://support.aha.io/hc/en-us/articles/205401475-JIRA-error-Field-FixVersions-cannot-be-set-It-is-not-on-the-appropriate-screen-or-unknown-

And this for the solution: http://support.aha.io/hc/en-us/articles/204837595

Be careful to not put it on the default screen for normal users,

Thanks!