tests.unfreeze_time() errors if search_path begins with test_overrides

[chrisb2244]

Copied subset from the 0.0.6 version file, marked the problematic line (at the very end)

CREATE OR REPLACE FUNCTION tests.freeze_time(frozen_time timestamp with time zone)
    ...
    -- Add test_overrides to search path if needed
    IF current_setting('search_path') NOT LIKE 'test_overrides,%' THEN
        -- store search path for later
        PERFORM set_config('tests.original_search_path', current_setting('search_path'), true);
        
        -- add tests schema to start of search path
        PERFORM set_config('search_path', 'test_overrides,' || current_setting('tests.original_search_path') || ',pg_catalog', true);
    END IF;

    -- create an overwriting now function
    PERFORM set_config('tests.frozen_time', frozen_time::text, true);

END
$$ LANGUAGE plpgsql;


CREATE OR REPLACE FUNCTION tests.unfreeze_time()
    RETURNS void
AS $$
BEGIN
    -- restore the original now function
    PERFORM set_config('tests.frozen_time', null, true);
    -- restore the original search path
    PERFORM set_config('search_path', current_setting('tests.original_search_path'), true);
    -- ^^^^^^^^  THIS LINE IS UNCONDITIONAL ^^^^^^^
END
$$ LANGUAGE plpgsql;