Fix Recall/Precision multi_label, not averaged for DDP

[vfdev-5]

🚀 Feature

Idea is to fix that

ignite/ignite/metrics/precision.py

Lines 23 to 30 in 002b595

	if idist.get_world_size() > 1:
	if (not average) and is_multilabel:
	warnings.warn(
	"Precision/Recall metrics do not work in distributed setting when average=False "
	"and is_multilabel=True. Results are not reduced across computing devices. Computed result "
	"corresponds to the local rank's (single process) result.",
	RuntimeWarning,
	)