Reset g_socks5_interrupt before each socks5 fuzz input.
CThreadInterrupt remains interrupted until explicitly reset. Previously,
inputs executed after the first input setting the interrupt flag inherited its
state. As corpus inputs are shuffled between all-input coverage runs, the
number of affected inputs and the resulting coverage counts could differ.
Tested with the complete 91-input socks5 corpus. The all-input deterministic
coverage check passes.