internal/deepprint: stop printing struct field names

The struct field names don't change within a single run,
so they are irrelevant. Use the field index instead.

name    old time/op    new time/op    delta
Hash-8    6.52µs ± 0%    6.64µs ± 0%   +1.91%  (p=0.000 n=6+9)

name    old alloc/op   new alloc/op   delta
Hash-8    1.67kB ± 0%    1.54kB ± 0%   -7.66%  (p=0.000 n=10+10)

name    old allocs/op  new allocs/op  delta
Hash-8      53.0 ± 0%      37.0 ± 0%  -30.19%  (p=0.000 n=10+10)

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
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Gitea Version: 1.28.0+dev-477-g8b6ad49a5f