Address SwiftLint violations that could be auto-corrected

Via `make format`, which internally runs `swiftlint --autocorrect`

Author: mokagio

WordPressAuthenticator/Analytics/AuthenticatorAnalyticsTracker.swift

@@ -83,7 +83,7 @@ public class AuthenticatorAnalyticsTracker {
         ///
         case loginWithSiteAddress = "login_site_address"
 
-        /// This flow starts when the user wants to troubleshoot their site by inputting its address 
+        /// This flow starts when the user wants to troubleshoot their site by inputting its address
         ///
         case siteDiscovery = "site_discovery"
 

WordPressAuthenticator/Authenticator/WordPressAuthenticator.swift

@@ -557,14 +557,14 @@ import WordPressKit
 
 public extension WordPressAuthenticator {
 
-    func getAppleIDCredentialState(for userID: String, completion:  @escaping (ASAuthorizationAppleIDProvider.CredentialState, Error?) -> Void) {
+    func getAppleIDCredentialState(for userID: String, completion: @escaping (ASAuthorizationAppleIDProvider.CredentialState, Error?) -> Void) {
         AppleAuthenticator.sharedInstance.getAppleIDCredentialState(for: userID) { (state, error) in
             // If credentialState == .notFound, error will have a value.
             completion(state, error)
         }
     }
 
-    func startObservingAppleIDCredentialRevoked(completion:  @escaping () -> Void) {
+    func startObservingAppleIDCredentialRevoked(completion: @escaping () -> Void) {
         appleIDCredentialObserver = NotificationCenter.default.addObserver(forName: AppleAuthenticator.credentialRevokedNotification, object: nil, queue: nil) { (_) in
             completion()
         }

WordPressAuthenticator/Logging/CocoaLumberjack.swift

@@ -2,7 +2,7 @@ import Foundation
 import CocoaLumberjack
 
 // June 14 2017 - @astralbodies
-// Taken from CocoaLumberjack repository - reproduced to prevent issue with 
+// Taken from CocoaLumberjack repository - reproduced to prevent issue with
 // CocoaPods and some weird bug with frameworks
 
 // Software License Agreement (BSD License)

WordPressAuthenticator/Navigation/NavigationCommand.swift

@@ -2,7 +2,7 @@ import Foundation
 
 /// NavigationCommand abstracts logic necessary provide clients of this library
 /// with a way to navigate to a particular location in the UL navigation flow.
-/// 
+///
 /// Concrete implementations of this protocol will decide what that means
 ///
 public protocol NavigationCommand {

WordPressAuthenticator/Signup/SignupEmailViewController.swift

@@ -136,7 +136,7 @@ class SignupEmailViewController: LoginViewController, NUXKeyboardResponder {
 
     // MARK: - Email Availability
 
-    private func checkEmailAvailability(completion:@escaping (Bool) -> Void) {
+    private func checkEmailAvailability(completion: @escaping (Bool) -> Void) {
 
         let remote = AccountServiceRemoteREST(
             wordPressComRestApi: WordPressComRestApi(baseUrlString: WordPressAuthenticator.shared.configuration.wpcomAPIBaseURL))