Remove redundancies

Author: acb-mv

ios/MullvadVPN/TunnelManager/SetAccountOperation.swift

@@ -35,14 +35,6 @@ enum SetAccountAction {
         case .delete: "Delete account"
         }
     }
-
-    // true if this action results in an account being set if successful
-    var isConstructive: Bool {
-        switch self {
-        case .unset, .delete: false
-        default: true
-        }
-    }
 }
 
 class SetAccountOperation: ResultOperation<StoredAccountData?> {

ios/MullvadVPN/TunnelManager/TunnelManager.swift

@@ -62,7 +62,7 @@ final class TunnelManager: StorePaymentObserver {
 
     private var privateKeyRotationTimer: DispatchSourceTimer?
     public private(set) var isRunningPeriodicPrivateKeyRotation = false
-    public private(set) var nextKeyRotationDate: Date? = nil
+    public private(set) var nextKeyRotationDate: Date?
 
     private var tunnelStatusPollTimer: DispatchSourceTimer?
     private var isPolling = false