[REPL] Autocompletion of keyword arguments with `do`-blocks is broken

[giordano]

In julia v1.11.5:

julia> code_llvm((Int,); deb<TAB>) do x; x; end

completes to

julia> code_llvm((Int,); debuginfo=) do x; x; end

In v1.12.0-beta4 it doesn't do anything.