Fix AdvantiumCookAction and AdvantiumWarmStatus ValueError for unknown enum values

[floydpink]

Fixes #109

Problem

The _missing_ methods for AdvantiumCookAction and AdvantiumWarmStatus raise ValueError for unrecognized values sent by the appliance (e.g., values 38 and 250). The converter's try/except catches this and falls back to a completely empty ErdAdvantiumCookSetting(), discarding all fields. This error logs every ~30 seconds, filling the Home Assistant log with noise.

Fix

Return a safe default (UNKNOWN / OFF) for any unrecognized value instead of raising. This matches the pattern already used by AdvantiumCookMode._missing_, which returns NO_MODE for values 153, 223, and 253.

Effect

• Before: unknown enum value → ValueError → entire cook setting discarded, error logged
• After: unknown enum value → safe default → full cook setting preserved (temperature, power level, cook time, etc. all come through), no error logged

No side effects — UNKNOWN and OFF are existing enum values already handled by downstream code.