Remove unused `<st:once>` tag

[codecov[bot]]

Codecov Report

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

Project coverage is 71.65%. Comparing base (68e4d40) to head (2a120e0). Report is 8 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #442 +/- ## ============================================ - Coverage 72.04% 71.65% -0.40% Complexity 221 221 ============================================ Files 17 17 Lines 1023 1030 +7 Branches 144 146 +2 ============================================ + Hits 737 738 +1 - Misses 198 203 +5 - Partials 88 89 +1 ```

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[jtnord]

thanks