Remove redundent SMB string

FreeAPS/Sources/Models/PumpHistoryEvent.swift

@@ -46,7 +46,7 @@ struct PumpHistoryEvent: JSON, Equatable {
 
 enum EventType: String, JSON {
     case bolus = "Bolus"
-    case SMB = "SMB"
+    case SMB
     case mealBolus = "Meal Bolus"
     case correctionBolus = "Correction Bolus"
     case snackBolus = "Snack Bolus"