tests/cql_query_test: Fix view creation in test_duration_restrictions()

The materialized view created in test_duration_restriction() restricts
on a non-PK column. Since Scylla's ALLOW FILTERING and secondary index
validation path is broken, once we start to do secondary index queries,
query processor thinks there's a secondary index backing that non-PK
column and fails because it's unable to find such column.

Fix up the view to only trigger the duration type validation error we're
interested in here.

tests/cql_query_test.cc

@@ -1205,7 +1205,6 @@ SEASTAR_TEST_CASE(test_duration_restrictions) {
                                     env,
                                     "create materialized view my_mv as"
                                     " select * from my_table0 "
-                                    " where name = 'abc' "
                                     " primary key (key, span);",
                                     "Cannot use Duration column 'span' in PRIMARY KEY of materialized view");
                         });