Fixed sb_npsp_create_donation() to allow StageName value other than "Pledged"

Removing `$object['StageName'] = 'Pledged';` from sb_npsp_create_donation(). It was preventing recurring donations from syncing with any other StageName value (e.g. "Posted" when successfully charged).

This line in `sp_npsp_create_donation()` was previously removed in commit f848a3bf3385cf76303a414f0af4f545fc83abdb, but it reappeared in commit 753fbf22dbddf24fb520bcc7512023a3901759f6 along with other valid code changes.