tests/functional: Put the or1k_sim test into the slow category

Looks like a copy-n-paste mistake while adding the or1k_sim test
here: The test downloads an asset from the internet, so it should
be in the thorough category, not in the quick one.

Signed-off-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

tests/functional/meson.build

@@ -92,7 +92,7 @@ tests_mips64el_system_thorough = [
   'mips64el_malta',
 ]
 
-tests_or1k_system_quick = [
+tests_or1k_system_thorough = [
   'or1k_sim',
 ]