CAT.POL.A.105 (d) For performance purposes, a damp runway, other than a grass runway, may be considered to be dry.
I guess it depends on the company, although most consider damp runway a dry one. The captain can obviously decide to take wet performance, just know that if donkey failes at V1 (V1wet < V1dry) your vertical margin at the end of runway might be lower (15ft instead of 35ft), despite your "more conservative" approach.
Oh, and there are many guys who preach about "more conservative approach" (wet for damp and then TOGA for wet, which is actually damp, etc.), but then follow the nice yellow line during line-up and stop the aircraft 100m into the runway.
