re-attach offline drive after new drive replacement (#10416)

inconsistent drive healing when one of the drive is offline
while a new drive was replaced, this change is to ensure
that we can add the offline drive back into the mix by
healing it again.

cmd/global-heal.go

@@ -73,11 +73,14 @@ func getLocalBackgroundHealStatus() (madmin.BgHealState, bool) {
 		return madmin.BgHealState{}, false
 	}
 
+	objAPI := newObjectLayerWithoutSafeModeFn()
+	if objAPI == nil {
+		return madmin.BgHealState{}, false
+	}
+
 	var healDisks []string
-	for _, eps := range globalBackgroundHealState.getHealLocalDisks() {
-		for _, ep := range eps {
-			healDisks = append(healDisks, ep.String())
-		}
+	for _, ep := range getLocalDisksToHeal() {
+		healDisks = append(healDisks, ep.String())
 	}
 
 	return madmin.BgHealState{