Exposed, weathered and oxidised copper bulbs are unwaxed in trial chambers

The bug

The copper bulbs in the trial chamber are of various oxidisation levels. However only the default copper bulb is waxed, the others are all unwaxed.

This is caused by the processor list trial_chambers_copper_bulb_degradation replacing the waxed_copper_bulb with unwaxed exposed_copper_bulb, etc.

How to reproduce

1. Find a trial chamber
2. Inspect the copper bulbs and notice some are waxed and some are unwaxed.