Make `can_compress_scripts` option autoload.

[spacedmonkey]

The can_compress_scripts option is loaded in script_concat_settings function. This function is called on every page request. This option should be autoloaded, as it currently requests another database request to the option.

The reason why this option is not autoloaded, when the option is saved it calls update_site_option, which fallbacks to calling add_site_option and

$result = add_option( $option, $value, '', 'no' );

[adamsilverstein]

This function is called on every page request. This option should be autoloaded, as it currently requests another database request to the option.

Makes sense to me, one less db query sounds good.

[spacedmonkey]

Duplicate of #55270.