fix error message for taskid that persists when changing task

[lassopicasso]

Description

Solves the issue where an error message remains on taskid even when changing task.

Related Issue(s)

• 12892

Verification

• [x] Your code builds clean without any errors or warnings
• [x] Manual testing done (required)
• [ ] Relevant automated test added (if you find this hard, leave it and we'll help out)

Documentation

• [ ] User documentation is updated with a separate linked PR in altinn-studio-docs. (if applicable)

[codecov[bot]]

Codecov Report

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

Project coverage is 91.04%. Comparing base (02ee823) to head (56cc683).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #12899 +/- ## ========================================== - Coverage 91.04% 91.04% -0.01% ========================================== Files 1385 1385 Lines 19691 19690 -1 Branches 2388 2388 ========================================== - Hits 17928 17927 -1 Misses 1501 1501 Partials 262 262 ```

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