Fix FLAG_SECURE import in LoginActivity

The FLAG_SECURE constant was incorrectly imported from Display instead of
WindowManager.LayoutParams. This fixes the import to use the correct location
for the flag that prevents screenshots and screen recording of the login screen.

Author: wmathurin

libs/SalesforceSDK/src/com/salesforce/androidsdk/ui/LoginActivity.kt

@@ -57,10 +57,10 @@ import android.provider.Settings.EXTRA_BIOMETRIC_AUTHENTICATORS_ALLOWED
 import android.security.KeyChain.choosePrivateKeyAlias
 import android.security.KeyChain.getCertificateChain
 import android.security.KeyChain.getPrivateKey
-import android.view.Display.FLAG_SECURE
 import android.view.KeyEvent
 import android.view.KeyEvent.KEYCODE_BACK
 import android.view.ViewGroup
+import android.view.WindowManager.LayoutParams.FLAG_SECURE
 import android.webkit.ClientCertRequest
 import android.webkit.SslErrorHandler
 import android.webkit.WebChromeClient