Update recursion ui error

[manunio]

I think previous input for filter-recursion ui test was not right as it was not triggering error for recursion itself, for example:

fn fuzzed_filter_recursion() {
    const TEMPLATE: &str = include_str!("../tests/filter-recursion.txt");
    if let Err(e) = Ast::from_str(TEMPLATE, None, &Syntax::default()) {
        panic!("{e}");
    }
}

---- tests::fuzzed_filter_recursion stdout ----
thread 'tests::fuzzed_filter_recursion' panicked at rinja_parser/src/tests.rs:1121:9:
failed to parse template source at row 1, column 255 near:
"|A|AA|A|A|A|A|AA|A|A|A|A|AA|A|A|A|A|AA|A"...

[GuillaumeGomez]

Thanks!