Fix a bug where the Post button would remain disabled when the postable requirement of having a title was the final requirement met
Fix a bug where the Post button would remain disabled when the postable requirement of having a title was the final requirement met

String constants used for naming parameters for the Pinboard API were incorrectly being used to observe PMBookmark key paths that affect the postable property.

kilovolt42/Pinmarker,kilovolt42/Pinmarker,kilovolt42/Pinmarker