`sqrt(Hermitian(A))` errors (due to fallback) for complex `A`

I hope this isn't a duplicate; I couldn't find an issue though. Here's an example:

julia> A = @SMatrix(rand(2, 2)) + im*@SMatrix(rand(2,2))
2×2 SArray{Tuple{2,2},Complex{Float64},2,4}:
 0.911161+0.30874im   0.152706+0.0236032im
  0.55638+0.107542im  0.175589+0.100683im 

julia> B= A*A'
2×2 SArray{Tuple{2,2},Complex{Float64},2,4}:
 0.949411+0.0im        0.569345+0.0625584im
 0.569345-0.0625584im  0.362093+0.0im      

julia> sqrt(B)
2×2 SArray{Tuple{2,2},Complex{Float64},2,4}:
 0.859886+0.0im       0.455524+0.050052im
 0.455524-0.050052im  0.389982+0.0im     

julia> sqrt(Hermitian(B))
ERROR: setindex!(::SArray{Tuple{2,2},Complex{Float64},2,4}, value, ::Int) is not defined.
Stacktrace:
 [1] error(::String) at ./error.jl:33
 [2] setindex!(::SArray{Tuple{2,2},Complex{Float64},2,4}, ::Float64, ::Int64) at /Users/eh540/.julia/packages/StaticArrays/VyRz3/src/indexing.jl:3
 [3] macro expansion at /Users/eh540/.julia/packages/StaticArrays/VyRz3/src/indexing.jl:51 [inlined]
 [4] _setindex!_scalar at /Users/eh540/.julia/packages/StaticArrays/VyRz3/src/indexing.jl:39 [inlined]
 [5] setindex! at /Users/eh540/.julia/packages/StaticArrays/VyRz3/src/indexing.jl:35 [inlined]
 [6] sqrt(::Hermitian{Complex{Float64},SArray{Tuple{2,2},Complex{Float64},2,4}}) at /Users/osx/buildbot/slave/package_osx64/build/usr/share/julia/stdlib/v1.1/LinearAlgebra/src/symmetric.jl:832
 [7] top-level scope at none:0

As you can see, it works without the Hermitian wrapper, and it also works in the real case. I will just not use the Hermitian wrapper, but I thought maybe the problem should be noted somewhere.

Reproduce the complex static-matrix example and start with the failing sqrt method at LinearAlgebra/src/symmetric.jl:832, then inspect StaticArrays indexing.jl from the stack trace. Confirm the fix with a regression test showing sqrt(Hermitian(B)) works for a complex SArray, while preserving the existing real case.