drop changes to atol default value

Author: thchr

stdlib/LinearAlgebra/src/generic.jl

@@ -1767,7 +1767,7 @@ promote_leaf_eltypes(x::Union{AbstractArray,Tuple}) = mapreduce(promote_leaf_elt
 # Supports nested arrays; e.g., for `a = [[1,2, [3,4]], 5.0, [6im, [7.0, 8.0]]]`
 # `a ≈ a` is `true`.
 function isapprox(x::AbstractArray, y::AbstractArray;
-    atol::Real=zero(promote_type(real(promote_leaf_eltypes(x)),real(promote_leaf_eltypes(y)))),
+    atol::Real=0,
     rtol::Real=Base.rtoldefault(promote_leaf_eltypes(x),promote_leaf_eltypes(y),atol),
     nans::Bool=false, norm::Function=norm)
     d = norm(x - y)