custom_calyptia: correctly set fleet_id for out_calyptia when fleet_name is set.

[pwhelan]

Summary

Setting the fleet_id for the output plugin was done in two places as well as hidden behind an else condition that would never execute. This change should more reliably set fleet_id for the calyptia output plugin.

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Testing
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• Example configuration file for the change
• Debug log output from testing the change

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• Run local packaging test showing all targets (including any new ones) build.
• Set ok-package-test label to test for all targets (requires maintainer to do).

Documentation

• Documentation required for this feature

Backporting

• Backport to latest stable release.

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