fix(Workspace): vim.ui.input expected table

[judaew]

I got follow error after using :Automaton create cmd:

Error executing Lua callback: vim/shared.lua:0: Expected table, got string
stack traceback:
        [C]: in function 'assert'
        vim/shared.lua: in function 'tbl_isempty'
        /opt/local/share/nvim/runtime/lua/vim/ui.lua:92: in function 'input'
        ...al/share/nvim/lazy/automaton.nvim/lua/automaton/init.lua:254: in function 'create_workspace'
        ...al/share/nvim/lazy/automaton.nvim/lua/automaton/init.lua:433: in function <...al/share/nvim/lazy/automaton.nvim/lua/automaton/init.lua:423>

[Dax89]

Thanks!