Use `ConnectedValue` for connected values

[mvdbeek]

I suppose the comment predated ConnectedValue on the Galaxy side ?

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 40.41%. Comparing base (785cd40) to head (c30a228).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #95 +/- ## ======================================= Coverage 40.41% 40.41% ======================================= Files 48 48 Lines 1915 1915 Branches 433 433 ======================================= Hits 774 774 Misses 1025 1025 Partials 116 116 ``` | [Flag](https://app.codecov.io/gh/galaxyproject/gxformat2/pull/95/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=galaxyproject) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/galaxyproject/gxformat2/pull/95/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=galaxyproject) | `40.41% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=galaxyproject#carryforward-flags-in-the-pull-request-comment) to find out more.

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.

[jmchilton]

I think it inspired it.