fixed a rare case where assets urls are created invalid

[vannidellaricca]

Hi,
we found an rare case in which library return an invalid url.
some preconditions:

• php engine jail in chrooted mode ( or DocumentRoot is in root filesystem).
• base root have the same name of domain
  which this condition in file Config.php on method get_url the function str_replace trigger the transformation many time for the string.
  this is te our test env

wp_list_pluck( $bases, 'base_dir' ) return

Array
(
    [wpmu_plugin] => /miodominiouno.it/ita/wp-content/mu-plugins
    [wp_plugin] => /miodominiouno.it/ita/wp-content/plugins
    [wp_content] => /miodominiouno.it/ita/wp-content
    [plugins] => /miodominiouno.it/ita/wp-content/plugins
    [stylesheet] => /miodominiouno.it/ita/wp-content/themes/twentytwentyfive
))

wp_list_pluck( $bases, 'base_url' ) return

Array
(
    [wpmu_plugin] => http://miodominiouno.it/ita/wp-content/mu-plugins
    [wp_plugin] => http://miodominiouno.it/ita/wp-content/plugins
    [wp_content] => http://miodominiouno.it/ita/wp-content
    [plugins] => http://miodominiouno.it/ita/wp-content/plugins
    [stylesheet] => http://miodominiouno.it/ita/wp-content/themes/twentytwentyfive
)

the transformation return
http:/http:/http://miodominiouno.it/ita/wp-content/plugins/the-events-calendar/common/

we have made a test using strtr that perform only one substitution and the code works.

We attach a 1 line patch

[bordoni]

@vannidellaricca thank you for this PR.

I would love to see us have a Test set for this @dpanta94 before we merge.

Not 100% a priority but worth the time after we finish Tyson.