Fix a bug where non-rowid primary keys would be identified as 'not indexed' for foreign key indexes rule

test_schemas/success.sql

@@ -11,3 +11,8 @@ create table stuff2 (
     stuff_id integer references stuff(rowid),
     alternative_stuff_id integer references stuff(amount)
 ) strict;
+
+create table stuff3 (
+    weird_pk3 integer primary key,
+    stuff2_id integer not null references stuff2(weird_pk)
+) strict;