internal/fuzz: change meaning of "total" in output

Fixes #51023

Change-Id: I7dd9f7c696e15ba9c6c887d4c4e0f4d281a82b17
Reviewed-on: https://go-review.googlesource.com/c/go/+/383414


Trust: Katie Hockman <katie@golang.org>
Reviewed-by: Roland Shoemaker <roland@golang.org>
Reviewed-by: Bryan Mills <bcmills@google.com>
Run-TryBot: Bryan Mills <bcmills@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>