Fix compatibility issue with PostgreSQL v11 (func)

The old query was not compatible with the most recent PostgreSQL v11.
The new query, unlike the old one will also additionally return the
custom aggregate functions.

SQLTools.sublime-settings

@@ -160,7 +160,7 @@
                     "options": ["--tuples-only", "--no-psqlrc"]
                 },
                 "functions": {
-                    "query": "select quote_ident(n.nspname) || '.' || quote_ident(f.proname) || '(' || pg_get_function_identity_arguments(f.oid) || ')' as funname from pg_catalog.pg_proc as f inner join pg_catalog.pg_namespace as n on n.oid = f.pronamespace where f.proisagg = false and n.nspname not in ('pg_catalog', 'information_schema');",
+                    "query": "select quote_ident(n.nspname) || '.' || quote_ident(f.proname) || '(' || pg_get_function_identity_arguments(f.oid) || ')' as funname from pg_catalog.pg_proc as f inner join pg_catalog.pg_namespace as n on n.oid = f.pronamespace where n.nspname not in ('pg_catalog', 'information_schema');",
                     "options": ["--tuples-only", "--no-psqlrc"]
                 }
             }