sidebar parameters (before_widget, before_title) not Working

The issue is in your params array. There was a missing closing > in before_widget and before-title should be before_title.

Try this:

array(
    'name' => 'Sidebar',
    'id' => 'sidebar-1',
    'class' => 'custom',
    'description' => 'Standard Sidebar',
    'before_widget' => '<aside id="%1$s" class="widget %2$s">',
    'after_widget' => '</aside>',
    'before_title' => '<h1 class="widget-title">',
    'after_title' => '</h1>',
  )

Hope it helps!