reposition buttons in Log In and Unlock pages (#1073)

* reposition buttons in Log In and Unlock pages

-   Log In page: move Log In button to primary location below password
    entry, move Get Your Master Password Hint to the More Options menu
-   Unlock page (Verify Master Password): swap position of Unlock
    and Log Out buttons

* finish changes to improved login ui

- move Log Out button in lock screen to secondary menu
- show Get Hint button on login screen in the iOS autofill login flow

Co-authored-by: Matt Portune <59324545+mportune-bw@users.noreply.github.com>

src/iOS.Extension/LoadingViewController.cs

@@ -498,7 +498,6 @@ namespace Bit.iOS.Extension
                 vm.StartTwoFactorAction = () => DismissViewController(false, () => LaunchTwoFactorFlow(false));
                 vm.LogInSuccessAction = () => DismissLockAndContinue();
                 vm.CloseAction = () => CompleteRequest(null, null);
-                vm.HideHintButton = true;
             }
 
             var navigationPage = new NavigationPage(loginPage);