SWF-11 Change context for segue

- As a result of the change to modal presentation, the function we must override has changed
- Instead of returning the context for the next interface controller, we return an array of contexts, each corresponding to the interface controllers in the order they appear in the navigation stack (Account details is first, transactions is now second)
- once web service is set up, transactions should be passed to TransactionsInterfactController from this function

SynchronyFinancial/SynchronyFinancial WatchKit Extension/AccountTableInterfaceController.swift

@@ -31,11 +31,12 @@ class AccountTableInterfaceController: WKInterfaceController {
         super.didDeactivate()
     }
 
-    //swiftlint:disable:next line_length
-    override func contextForSegue(withIdentifier segueIdentifier: String, in table: WKInterfaceTable, rowIndex: Int) -> Any? {
+    override func contextsForSegue(withIdentifier segueIdentifier: String, in table: WKInterfaceTable, rowIndex: Int) -> [Any]? {
         if segueIdentifier == "showAccountDetails" {
+            // account data is passed to the first interface controller in our new navigation stack
+            // if we want to pass to subsequent interface controllers, we would add them in corresponding order
             acctDict.updateValue(accounts[rowIndex], forKey: "acct")
-            return acctDict
+            return [acctDict]
         }
         return nil
     }