Fix wrong sigmoid adjustment factor

FreeAPS/Sources/Models/Preferences.swift

@@ -43,7 +43,7 @@ struct Preferences: JSON {
     var timestamp: Date?
     var maxDeltaBGthreshold: Decimal = 0.2
     var adjustmentFactor: Decimal = 0.8
-    var adjustmentFactorSigmoid: Decimal = 0.8
+    var adjustmentFactorSigmoid: Decimal = 0.5
     var sigmoid: Bool = false
     var enableDynamicCR: Bool = false
     var useNewFormula: Bool = false