Sorting issues by title is broken (BB-7502)

Sorting by title produces same result as sorting by create date, because issue number is prefixed. This does not make much sense because:

• creating custom prefixes (e.g. due date) will not be taken into consideration when sorting
• as implemented this functionality is duplicate of sorting by create date
• there is no way to control issue number. When creating issue, title is - well title, not hash + issuenumber + title.