tests: do not skip solo-run tests if running within a single job and all remaining...

tests: do not skip solo-run tests if running within a single job and all remaining tests are solo-run

There was a logic error, which results in not running solo tests
if TEST_JOBS=1, and we have finished running the regular test
and the remaining tests are all solo-run. They all get put into
that pile, but the new runners never start.

Solution: check the pile of solo-run jobs unconditionally.

Thanks to Klement Sekera for spotting the issue.

Type: fix
Change-Id: Iaecacbe4de44050cd8d0ff2d524559df99f2bae4
Signed-off-by: Andrew Yourtchenko <ayourtch@gmail.com>