assertion prints - this is a user bug in the object stringifier

[Cade-Peterson]

There is a similar bug #463 that is already closed.

However for the case below

Test(assertions, none) {
    cr_expect(none(eq(int, 1, 1), eq(int, 3, 3), eq(int, 3, 3)));
}

There is no custom type and we still get the output:

[----] Criterion v2.4.3
[====] Running 1 test from assertion:
[RUN ] assertion::testing
[----] minimal.c:19: Assertion Failed
[----]   eq(int, 1, 1): 
[----]     @@@ <no difference -- this is a user bug in the object stringifier>
[----]   eq(int, 3, 3): 
[----]     @@@ <no difference -- this is a user bug in the object stringifier>
[----]   eq(int, 3, 3): 
[----]     @@@ <no difference -- this is a user bug in the object stringifier>
[FAIL] assertion::testing: (0.00s)
[====] Synthesis: Tested: 1 | Passing: 0 | Failing: 1 | Crashing: 0