Fix mistake in SQL features list

Fix for c9f5754: Feature F302-02 was renamed to F305, but that
commit failed to delete the old line.

Reported-by: Satoru Koizumi (小泉 悟) <koizumistr@minos.ocn.ne.jp>
Discussion: https://www.postgresql.org/message-id/flat/170866661469.645.14101429540172934386%40wrigleys.postgresql.org

Author: petere

src/backend/catalog/sql_features.txt

@@ -231,7 +231,6 @@ F292	UNIQUE null treatment			YES
 F301	CORRESPONDING in query expressions			NO	
 F302	INTERSECT table operator			YES	
 F303	INTERSECT DISTINCT table operator			YES	
-F302	INTERSECT table operator	02	INTERSECT ALL table operator	YES	
 F304	EXCEPT ALL table operator			YES	
 F305	INTERSECT ALL table operator			YES	
 F311	Schema definition statement			YES