👌 Use clp-guide megacomplex instead of the 1x1 k-matrix workaround

[s-weigand]

This change updates the syntax of the spectral guide example to use a clp-guide megacomplex instead of the initial workaround of a to use a decay megacomplex where the k-matrix only has a single compartment that decays to the ground state.

Change summary

• 👌 Use clp-guide megacomplex instead of the 1x1 k-matrix workaround

Checklist

• ✔️ Passing the tests (mandatory for all PR's)

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[jsnel]

Passes validation so 👍