Avoid creating a useless tuple from an array in at-uncertain macro

[giordano]

Thanks @dpshelio for spotting this!

For example, on master:

julia> @benchmark @uncertain atan(1, 2)
BenchmarkTools.Trial: 
  memory estimate:  864 bytes
  allocs estimate:  26
  --------------
  minimum time:     933.957 ns (0.00% GC)
  median time:      960.522 ns (0.00% GC)
  mean time:        1.265 μs (19.62% GC)
  maximum time:     1.731 ms (99.90% GC)
  --------------
  samples:          10000
  evals/sample:     23

With this PR:

julia> @benchmark @uncertain atan(1, 2)
BenchmarkTools.Trial: 
  memory estimate:  768 bytes
  allocs estimate:  22
  --------------
  minimum time:     495.918 ns (0.00% GC)
  median time:      517.732 ns (0.00% GC)
  mean time:        594.881 ns (10.37% GC)
  maximum time:     211.667 μs (99.72% GC)
  --------------
  samples:          10000
  evals/sample:     194

[codecov-io]

Codecov Report

Merging #32 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master      #32   +/-   ##
=======================================
  Coverage   97.32%   97.32%           
=======================================
  Files           9        9           
  Lines         523      523           
=======================================
  Hits          509      509           
  Misses         14       14

Impacted Files	Coverage Δ
src/math.jl	99.73% <100%> (ø)	⬆️

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