oniro-sanity.bbclass: Compatible distro was removed

Given that the backwards compatible distro was removed, we can also drop
now the check in the sanity class.

Signed-off-by: Andrei Gherzan <andrei.gherzan@huawei.com>

meta-oniro-core/classes/oniro-sanity.bbclass

@@ -12,7 +12,6 @@ ONIRO_DEPRECATED_COLLECTIONS = " \
 
 # Same format as for ONIRO_DEPRECATED_COLLECTIONS but for DISTRO configurations.
 ONIRO_DEPRECATED_DISTROS = " \
-    allscenarios-linux-demo-dashboard:allscenarios-linux-blueprint-dashboard \
     "
 
 def unpack_deprecation(elem) -> 'Tuple[str, str]':