Make the user arguments for get_edit_profile_url() and get_dashboard_url()...

Make the user arguments for get_edit_profile_url() and get_dashboard_url() optional, defaulting to the current user.

props garyc40.
fixes #16686.

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git-svn-id: https://core.svn.wordpress.org/trunk@27117 1a063a9b-81f0-0310-95a4-ce76da25c4cd