threadsnoop: increase PID field width and align to the right #18

Job	Run time
build_test (LLVM 10 Debug, Debug, .#bpftrace-llvm10, probe.kprobe_offset_fail_size,usdt.usdt prob...	4m 46s
clang-format	0s
build_test (LLVM 10 Release, Release, .#bpftrace-llvm10, probe.kprobe_offset_fail_size,usdt.usdt ...	4m 46s
build_test (LLVM 10 Clang Debug, Debug, .#bpftrace-llvm10, clang, clang++, probe.kprobe_offset_fa...	4m 47s
build_test (LLVM 11 Debug, Debug, .#bpftrace-llvm11, probe.kprobe_offset_fail_size,usdt.usdt prob...	4m 45s
build_test (LLVM 11 Release, Release, .#bpftrace-llvm11, probe.kprobe_offset_fail_size,usdt.usdt ...	4m 46s
build_test (LLVM 12 Release, Release, .#bpftrace-llvm12, probe.kprobe_offset_fail_size,usdt.usdt ...	4m 45s
build_test (LLVM 13 Release, Release, .#bpftrace-llvm13, probe.kprobe_offset_fail_size,usdt.usdt ...	4m 47s
build_test (LLVM 14 Release, Release, .#bpftrace-llvm14, probe.kprobe_offset_fail_size,usdt.usdt ...	4m 46s
build_test (LLVM 15 Release, Release, .#bpftrace-llvm15, probe.kprobe_offset_fail_size,usdt.usdt ...	4m 48s
build_test (LLVM 16 Release, Release, .#bpftrace-llvm16, probe.kprobe_offset_fail_size,usdt.usdt ...	4m 44s
build_test (LLVM 17 Release, Release, .#bpftrace-llvm17, probe.kprobe_offset_fail_size,usdt.usdt ...	4m 45s
build_test (Memleak test (LLVM 11 Debug), Debug, .#bpftrace-llvm11, 1, 0)	4m 45s
build_test (Memleak test (LLVM 11 Release), Release, .#bpftrace-llvm11, 1, 0)	4m 39s
irc	1s
	1h 1m 50s

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