Fix Telescope live_grep showing preview in the Results pane

[AndreasNasman]

It seems quite redundant to show the search match in the Results pane when it's shown and highlighted in the Preview pane.

[AndreasNasman]

This seems to be tightly coupled to rg, as that's what live_grep uses under the hood.
You can give --files-with-matches as an additional_argument to live_grep, but that removes the highlights from the Preview pane.

BurntSushi/ripgrep#103
nvim-telescope/telescope.nvim#770
https://www.reddit.com/r/neovim/comments/qru0w2/finergrained_control_over_your_telescope_grepping/

Having only_sort_text option available for live_grep I think would some the problem.
nvim-telescope/telescope.nvim#419

[AndreasNasman]

Tested giving these options to Telescope

		opts = {
			pickers = {
				live_grep = {
					additional_args = function(opts)
						-- return opts
						return vim.tbl_deep_extend("force", opts, { "-l" })
					end,
				},
			},
		},

but it doesn't quite work.

[AndreasNasman]

Having this behavior is actually quite handy, let's keep it as is for now.