[bisq-network/bisq] Tidy up CorePriceService (refactor) (#4594)

[Stan]

Remove unnecessary String.format call and do a null check.

You can view, comment on, or merge this pull request online at:

  https://github.com/bisq-network/bisq/pull/4594

-- Commit Summary --

  * Tidy up CorePriceService

-- File Changes --

    M core/src/main/java/bisq/core/api/CorePriceService.java (10)

-- Patch Links --

https://github.com/bisq-network/bisq/pull/4594.patch
https://github.com/bisq-network/bisq/pull/4594.diff

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