Add preferred action to all alert dialogs.

iOS/Inspector/AccountInspectorViewController.swift

@@ -112,6 +112,7 @@ class AccountInspectorViewController: UITableViewController {
 			}
 		}
 		alertController.addAction(markAction)
+		alertController.preferredAction = markAction
 		
 		present(alertController, animated: true)
 	}

iOS/Inspector/ExtensionInspectorViewController.swift

@@ -39,6 +39,7 @@ class ExtensionPointInspectorViewController: UITableViewController {
 			self?.navigationController?.popViewController(animated: true)
 		}
 		alertController.addAction(markAction)
+		alertController.preferredAction = markAction
 		
 		present(alertController, animated: true)
 		

iOS/Inspector/WebFeedInspectorViewController.swift

@@ -217,6 +217,7 @@ extension WebFeedInspectorViewController {
 		let dismiss = UIAlertAction(title: NSLocalizedString("Dismiss", comment: "Dismiss"), style: .cancel, handler: nil)
 		alert.addAction(openSettings)
 		alert.addAction(dismiss)
+		alert.preferredAction = openSettings
 		return alert
 	}
 	

iOS/MasterFeed/MasterFeedViewController.swift

@@ -1219,6 +1219,7 @@ private extension MasterFeedViewController {
 		}
 		
 		alertController.addAction(renameAction)
+		alertController.preferredAction = renameAction
 		
 		alertController.addTextField() { textField in
 			textField.text = name
@@ -1256,6 +1257,7 @@ private extension MasterFeedViewController {
 			self?.delete(indexPath: indexPath, feedID: feedID)
 		}
 		alertController.addAction(deleteAction)
+		alertController.preferredAction = deleteAction
 		
 		self.present(alertController, animated: true)
 	}

iOS/UIKit Extensions/UIViewController-Extensions.swift

@@ -43,6 +43,7 @@ private extension UIViewController {
 			}
 			
 			alertController.addAction(credentialsAction)
+			alertController.preferredAction = credentialsAction
 
 		}