Fixed issue where adding a preferred device would break the run dialog

[sainttttt]

Before this pull I would get this error with the following config:

Error:

E5108: Error executing lua: ...s/saint/.local/share/nvim/lazy/xbase/lua/xbase/state.lua:14: attempt to get length of local 'devices' (a nil value)
stack traceback:
        ...s/saint/.local/share/nvim/lazy/xbase/lua/xbase/state.lua:14: in function 'assert_devices'
        ...s/saint/.local/share/nvim/lazy/xbase/lua/xbase/state.lua:41: in function 'devices'
        .../.local/share/nvim/lazy/xbase/lua/xbase/pickers/util.lua:90: in function 'iterate'
        .../.local/share/nvim/lazy/xbase/lua/xbase/pickers/util.lua:112: in function 'generate_entries'
        ...al/share/nvim/lazy/xbase/lua/xbase/pickers/telescope.lua:50: in function 'find'
        ...al/share/nvim/lazy/xbase/lua/xbase/pickers/telescope.lua:76: in function <...al/share/nvim/lazy/xbase/lua/xbase/pickers/telescope.lua:73>
Press ENTER or type command to continue

Config:

      require'xbase'.setup({
                sourcekit = {
                },
                simctl = {
                  iOS = {
                    "iPhone 14"
                  },
                  watchOS = {}, -- all available devices
                  tvOS = {}, -- all available devices
                },
      }) 

With this commit, it fixes the issue and works as expected, without error.

[kkharji]

Thanks @sainttttt I don't know how I missed that one