Fix forward make_zero rule return type

[wsmoses]

No description provided.

[github-actions]

Benchmark Results

	main	0d11d7f...	main / 0d11d7f...
basics/make_zero/namedtuple	0.0483 ± 0.013 μs	0.0467 ± 0.0054 μs	1.04 ± 0.3
basics/make_zero/struct	0.247 ± 0.016 μs	0.241 ± 0.008 μs	1.03 ± 0.076
basics/overhead	5.18 ± 0.013 ns	3.58 ± 0.008 ns	1.45 ± 0.0049
basics/remake_zero!/namedtuple	0.229 ± 0.01 μs	0.225 ± 0.0084 μs	1.02 ± 0.058
basics/remake_zero!/struct	0.231 ± 0.012 μs	0.227 ± 0.0096 μs	1.02 ± 0.068
fold_broadcast/multidim_sum_bcast/1D	10.5 ± 1.3 μs	10.5 ± 0.59 μs	1 ± 0.13
fold_broadcast/multidim_sum_bcast/2D	11.8 ± 0.32 μs	11.8 ± 0.32 μs	1 ± 0.038
time_to_load	1.47 ± 0.018 s	1.45 ± 0.012 s	1.01 ± 0.015

Benchmark Plots

A plot of the benchmark results has been uploaded as an artifact at https://github.com/EnzymeAD/Enzyme.jl/actions/runs/29031917124/artifacts/8205333101.