Add config to select current item by default

[Noino]

Is your feature request related to a problem? Please describe. I recently moved over to telescope to be the tool through which i swap buffers, as well as swapping between tmux sessions. Having worked with this for some month..

Describe the solution you'd like .. i would like it so that in those pickers the default selected line is the current item. aka, when i have 10 buffers open, the telescope picker should by default have its cursor on the current buffer filename, so that bufferpickerhotkey+arrows always yielded the same result

Describe alternatives you've considered I considered living with it, but i dont fee comfortable. Another would be going back to buffer_manager.nvim, but i dont really like that option either