Remove left-over picard -Xms java flags

[jfy133]

For this in in the previous PR java-tool-fixes, sorry!

PR checklist

• This comment contains a description of changes (with reason).
• If you've fixed a bug or added code that should be tested, add tests!
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• Ensure the test suite passes (nextflow run . -profile test,docker).
• Usage Documentation in docs/usage.md is updated.
• Output Documentation in docs/output.md is updated.
• CHANGELOG.md is updated.
• README.md is updated (including new tool citations and authors/contributors).

[github-actions]

Hi @jfy133,

It looks like this pull-request is has been made against the nf-core/eager master branch.
The master branch on nf-core repositories should always contain code from the latest release.
Because of this, PRs to master are only allowed if they come from the nf-core/eager dev branch.

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Thanks again for your contribution!