BoldGrid Attribution should not be toggleable without license

[bwmarkle]

Please see:

• boldgrid-theme-framework/src/includes/customizer/class-boldgrid-framework-customizer-footer.php

  Lines 43 to 51 in 1035fa8

  	// BoldGrid.com Link.
  	if ( ! get_theme_mod( 'hide_boldgrid_attribution' ) ) {
  	$theme_mods .= sprintf(
  	'<span class="link boldgrid-attribution-link">%s <a href="%s" rel="nofollow" target="_blank">%s</a></span>',
  	__( 'Built with', 'bgtfw' ),
  	'http://boldgrid.com/',
  	__( 'BoldGrid', 'bgtfw' )
  	);
  	}

• https://docs.google.com/spreadsheets/d/1VxnZ5ejNkpj2TIhJ1NxLsq9iJ7hZerQEA05J9VACBNo/edit#gid=0

[jessecowens]

Adding to Bug Scrub 2.8.1 Milestone. The current behavior where 1. The option is toggleable without a license and 2. The trash can "delete" icon does not function is frustrating for users.