Swap containers for GET_META and GET_PATH

[SPPearce]

Swap the containers for GET_META and GET_PATH to use the base ubuntu image already pulled for CAT_FASTQ, as they are already pulled by the pipeline. Helps those who struggle to download containers on a cluster.

PR checklist

• [X] This comment contains a description of changes (with reason).
• [ ] If you've fixed a bug or added code that should be tested, add tests!
  • [ ] If you've added a new tool - have you followed the pipeline conventions in the contribution docs
  • [ ] If necessary, also make a PR on the nf-core/rnafusion branch on the nf-core/test-datasets repository.
• [ ] Make sure your code lints (nf-core lint).
• [ ] Ensure the test suite passes (nextflow run . -profile test,docker --outdir <OUTDIR>).
• [ ] Usage Documentation in docs/usage.md is updated.
• [ ] Output Documentation in docs/output.md is updated.
• [X] CHANGELOG.md is updated.
• [ ] README.md is updated (including new tool citations and authors/contributors).

[apeltzer]

@SPPearce - can you add this to the changelog too?

[apeltzer]

@nf-core-bot fix linting

[rannick]

Closing this in favor of the more computationally efficient #282