toaster: Exclude "command line builds" project from projects typeahead

toaster: Exclude "command line builds" project from projects typeahead

The "New build" drop-down provides autocomplete for Toaster projects.

However, it should not include the default project (for command
line builds), as it should not be possible for the user to
select this project as the container for a Toaster build.

[YOCTO #8231]

Signed-off-by: Elliot Smith <elliot.smith@intel.com>
Signed-off-by: Ed Bartosh <ed.bartosh@linux.intel.com>
Signed-off-by: brian avery <avery.brian@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>