Fix #12443: Moving bugs - check for reporter permissions in destinati…

…on project

The user with enough rights to move a bug into another project, is
allowed to move it into a project in which he has only 'viewer' rights.

Steps to reproduce this bug:
1. User has full rights in project A (enough to report and move bugs)
2. User has 'viewer' right in project B
3. User creates a bug in project A and is allowed to move it into project B

Signed-off-by: David Hicks <d@hx.id.au>