Fix leftPad / rightPad function with FixedString input

[Algunenano]

Changelog category (leave one):

• Bug Fix (user-visible misbehavior in an official stable release)

Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):

• Fix leftPad / rightPad function with FixedString input

Documentation entry for user-facing changes

Closes #59604

[robot-ch-test-poll1]

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