MIME-less `show` should return valid Julia code

[nsajko]

This is not correct:

NDimensionalSparseArrays.jl/src/ndsparsearray.jl

Lines 370 to 376 in 6fde3dc

	# Base show method (without MIME) - delegates to text/plain
	function Base.show(io::IO, A::NDSparseArray{T, N}) where {T, N}
	return show(io, MIME"text/plain"(), A)
	end
	# Improved display with better formatting
	function Base.show(io::IO, ::MIME"text/plain", A::NDSparseArray{T, N}) where {T, N}

As the doc string says:

The representation used by show generally includes Julia-specific formatting and type information, and should be parseable Julia code when possible.

[...]

For a more verbose human-readable text output for objects of type T, define show(io::IO, ::MIME"text/plain", ::T) in addition.