Fix branchhing in edit_post() where attachment_fields_to_save would only run...

Fix branchhing in edit_post() where attachment_fields_to_save would only run when the alt text was sent. It should run whenever an attachment is saved. props sc0ttclark. fixes #22774.



git-svn-id: https://core.svn.wordpress.org/trunk@23088 1a063a9b-81f0-0310-95a4-ce76da25c4cd