add -n to echo command in kmc to avoid new line

[frankambrosio3]

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Terra

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• The workflow/task has been tested locally and on Terra
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[cimendes]

Testing:

• TheiaCoV_ONT: https://app.terra.bio/#workspaces/theiagen-validations/Theiagen_Mendes_Sandbox/job_history/6f085327-aac0-4181-a73b-2ba82ff068e9
• TheiaProk_ONT: https://app.terra.bio/#workspaces/theiagen-validations/Theiagen_Mendes_Sandbox/job_history/234b4f91-9dd1-48a0-844a-93b986767200

[cimendes]

The TheiaCoV_ONT run was a success with the exception of the MPXV runs as I failed to pass on the correct dataset tag to nextclade, so the error is unrelated to the changes in this PR.

8 runs on TheiaProk_ONT were aborted after several days of running. KMC outputted genome sizes of > 20 Million basepairs for these sequences. This issue is unrelated to this PR but I still think it's worth taking note.

Regarding the newline issue, this has been successfully fixed by the PR, so once it moves out of draft status I'll be approving it. :)