fix: (terminal) buffer previewer (#1120)

Use existing buffers for buffer previewer to allow previewing special buffer types

lua/telescope/previewers/term_previewer.lua

@@ -294,9 +294,6 @@ previewers.vimgrep = defaulter(function(opts)
       if p == nil or p == "" then
         return
       end
-      if entry.bufnr and (p == "[No Name]" or vim.api.nvim_buf_get_option(entry.bufnr, "buftype") ~= "") then
-        return
-      end
 
       local lnum = entry.lnum or 0