[BUG] inspect expression returning a qualified type generates invalid Cpp1

[ntrel]

To Reproduce

    s = inspect v -> *const char {
        is _ = "";
    };

Cpp1 has invalid return char const*{}; statements:

        if (cpp2::is(_expr, 0)) { if constexpr( requires{"";} ) if constexpr( std::is_convertible_v<CPP2_TYPEOF(("")),char const*> ) return ""; else return char const*{}; else return char const*{}; }

[JohelEGP]

Actual reproducer (https://cpp2.godbolt.org/z/5TT6zz9rM):

main: () = {
  s = inspect v -> *const char {
    is 0 = "";
    is _ = "";
  };
}

Related: #525.