use padding instead of margin for SSO dialog whitespace

Fixes #9284

Signed-off-by: Andy Scherzinger <info@andy-scherzinger.de>

src/main/res/layout/activity_sso_grant_permission.xml

@@ -22,7 +22,7 @@
               xmlns:tools="http://schemas.android.com/tools"
               android:layout_width="wrap_content"
               android:layout_height="wrap_content"
-              android:layout_margin="@dimen/standard_margin"
+              android:padding="@dimen/standard_margin"
               android:orientation="horizontal"
               tools:context="com.owncloud.android.ui.activity.SsoGrantPermissionActivity">