Use supplied compiler name in dbcompiler

[seanmil]

Honor the value passed in for 'compiler' if specified. This
profile is intended to be used on compilers which are running
PuppetDB along with Puppetserver so using the same value
should work and, in the default case, the behavior is unchanged.

[puppet-community-rangefinder]

puppet_metrics_dashboard::profile::dbcompiler::install is a class

that may have no external impact to Forge modules.

This module is declared in 0 of 575 indexed public Puppetfiles.

---

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[jarretlavallee]

Looks good to me.