R1:474d528c3b85

Allow numeric constants to act as aliases for task priorities in the web UI <select />

Summary:
Ref T12124. This is a fairly narrow fix for existing saved EditEngine forms with a default priority value.

These saved forms have a numeric (or probably "string-numeric") default value, like "50". They lost their meaning after D18111, when "50" no longer appears in the dropdown. Instead, these forms all select the highest available priority.

At time of writing, this form was broken on this install, for…