pkg/fuzzer: improve triage procedure

1. Use the initial signal as the first attempt,
this should reduce total number of runs by 1 in common case.

2. Update max signal on each attempt.
If should eliminate additional runs later.

3. Update the signal we are chasing after each attempt.
It's possible that we won't get any of the orignal new signal,
but instead will get some other stable new signal.

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