Don't group unknown crash type across different libraries

[kcwu]

Otherwise all abort() and assert() failures of different projects will be grouped into single one.

[oliverchang]

This shouldn't be happening. Could you provide more details?

[kcwu]

This is crash list of chewing_default_fuzzer.
Following the crash report link, it is libFuzzer_tpm2_execute_command_fuzzer

[oliverchang]

Asserts should be properly detected and grouped now. Example testcase