"TW" I guess its seems obvious that a call for 'flaps 3' would be logical in this case but a 'go-around' can be made at any point during an approach (not necessarily in config full) inc in a clean config for that matter so calling 'go-round,(should be alight pause here) flaps' is a generic call as such to allow for all contingencies.:-)
Also the PF will be busy during the escape maneuver (especially in a break out maneuver during a PRM)& this is a time where the PF could call the actual flap setting he/she wanted incorrectly where as the PNF can allow more of his/her attention for this simple task of moving the flap lever up one stage:-)
Wmk2