Fix target for 'fv' (flowsheet visualizer) reference

[dangunter]

Fixes #1390

Summary/Motivation:

Hyperlink was changed

Changes proposed in this PR:

• Fix the one place it is used

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[codecov[bot]]

Codecov Report

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

Project coverage is 77.62%. Comparing base (923df9e) to head (b93e03d).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1391 +/- ## ========================================== - Coverage 77.62% 77.62% -0.01% ========================================== Files 391 391 Lines 64375 64375 Branches 14257 14257 ========================================== - Hits 49973 49970 -3 - Misses 11830 11834 +4 + Partials 2572 2571 -1 ```

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