Dashicons: Update to the latest files.

New icons:
* .dashicons-controls-play (f522)
* .dashicons-controls-pause (f523)
* .dashicons-controls-forward (f519)
* .dashicons-controls-skipforward (f517)
* .dashicons-controls-back (f518)
* .dashicons-controls-skipback (f516)
* .dashicons-controls-repeat (f515)
* .dashicons-controls-volumeon (f521)
* .dashicons-controls-volumeoff (f520)
* .dashicons-phone (f525)
* .dashicons-building (f512)
* .dashicons-store (f513)
* .dashicons-album (f514)
* .dashicons-palmtree (f527)
* .dashicons-tickets-alt (f524)
* .dashicons-money (f526)

Updated icons:
* .dashicons-align-left (f135)
* .dashicons-align-right (f136)
* .dashicons-align-center (f134)
* .dashicons-align-none (f138)

props liljimmi, melchoyce, empireoflight.
fixes #29444.
Built from https://develop.svn.wordpress.org/trunk@30797


git-svn-id: http://core.svn.wordpress.org/trunk@30787 1a063a9b-81f0-0310-95a4-ce76da25c4cd