perf hist: Fix width calculation in hpp__fmt()

hpp__width_fn() round up width to length of the field name,
hpp__fmt() should do it too. Otherwise, the numbers may
end up unaligned if the field name is long.

Signed-off-by: Dmitry Vyukov <dvyukov@google.com>
Reviewed-by: James Clark <james.clark@linaro.org>
Link: https://lore.kernel.org/r/20250108065949.235718-1-dvyukov@google.com


Signed-off-by: Namhyung Kim <namhyung@kernel.org>