Also unquote a function name followed by a comment

SELECT "pg_read_file" /* x */ ('/etc/passwd') still passed: the check
for a following parenthesis only skipped whitespace. Skip comments too.

tests/Unit/Service/SqlGuardTest.php

@@ -26,6 +26,8 @@ class SqlGuardTest extends TestCase
             ["SELECT dblink_exec('host=x', 'DROP TABLE t')"],
             ["SELECT \"pg_read_file\"('/etc/passwd')"],
             ["SELECT pg_catalog.\"pg_read_file\"('/etc/passwd')"],
+            ["SELECT \"pg_read_file\" /* x */ ('/etc/passwd')"],
+            ["SELECT \"pg_read_file\"-- x\n('/etc/passwd')"],
             ["SELECT dblink_send_query('c', 'SELECT 1')"],
             ["SELECT * FROM dblink('host=x', 'SELECT 1') AS t(a int)"],
             ["SELECT * FROM t INTO OUTFILE '/tmp/x'"],
@@ -127,6 +129,7 @@ class SqlGuardTest extends TestCase
             ["SELECT \"setval\"('seq', 1)"],
             ["SELECT pg_catalog.\"setval\"('seq', 1)"],
             ["SELECT pg_catalog.setval('seq', 1)"],
+            ["SELECT \"setval\" /* x */ ('seq', 1)"],
             ['MERGE INTO t USING s ON true WHEN MATCHED THEN DELETE'],
             ['VACUUM'],
             ['PRAGMA journal_mode = WAL'],