Error messages in convert sometimes put extra braces after eltype

[jishnub]

julia> using OffsetArrays, LinearAlgebra

julia> convert(OffsetArray{ComplexF64,2, Diagonal{ComplexF64,Vector{ComplexF64}}}, OffsetArray(zeros(ComplexF64,3,3), 0,0))
ERROR: MethodError: Cannot `convert` an object of type 
  OffsetArray{Complex{Float64{}},2,Matrix{ComplexF64}} to an object of type 
  OffsetArray{Complex{Float64{}},2,Diagonal{ComplexF64, Vector{ComplexF64}}}
Closest candidates are:
  convert(::Type{T}, ::Factorization) where T<:AbstractArray at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.7/LinearAlgebra/src/factorization.jl:58
  convert(::Type{T}, ::T) where T<:AbstractArray at abstractarray.jl:16
  convert(::Type{T}, ::T) where T at essentials.jl:228
  ...
Stacktrace:
 [1] top-level scope
   @ REPL[16]:1

julia> VERSION
v"1.7.0-DEV.1025"

The eltype in the error message is displayed as Complex{Float64{}} instead of Complex{Float64}. This only happens for some combinations of types.

[vtjnash]

Duplicate of #36644