#343 Post-Python 3: mod/submission_search_results.cgi bugs

[Ahasuerus]

mod/submission_search_results.cgi has the following bugs:

1. The code that validates the "status" parameter allows the following values: 'Pending', 'Approved', 'Rejected'. However, if another value is submitted, the displayed error message says "Status must be "Approved" or "Rejected"". It should also list 'Pending' as a supported values.
2. "from common import Queue" is redundant because the script also executes "from common import " earlier.