[bisq-network/bisq] Fix bash syntax inconsistencies (#5116)

[Stan]

Many unnecessary braces around `${VARIABLE}` references were removed.

Credit to @dmos62 for pointing out syntax inconsistencies while reviewing https://github.com/bisq-network/bisq/pull/5093.
You can view, comment on, or merge this pull request online at:

  https://github.com/bisq-network/bisq/pull/5116

-- Commit Summary --

  * Fix bash syntax inconsistencies

-- File Changes --

    M apitest/scripts/limit-order-simulation.sh (87)
    M apitest/scripts/trade-simulation-env.sh (32)
    M apitest/scripts/trade-simulation-utils.sh (42)
    M apitest/scripts/trade-simulation.sh (151)

-- Patch Links --

https://github.com/bisq-network/bisq/pull/5116.patch
https://github.com/bisq-network/bisq/pull/5116.diff

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