feat(entry_display): expose prompt_bufnr opt (#1934)

Required for `vim.ui.input` with file_browser extension
when prompt_bufnr may be left intermittently

lua/telescope/pickers/entry_display.lua

@@ -13,7 +13,7 @@ entry_display.create = function(configuration)
       local width
       table.insert(generator, function(item)
         if width == nil then
-          local status = state.get_status(vim.api.nvim_get_current_buf())
+          local status = state.get_status(vim.F.if_nil(configuration.prompt_bufnr, vim.api.nvim_get_current_buf()))
           local s = {}
           s[1] = vim.api.nvim_win_get_width(status.results_win) - #status.picker.selection_caret
           s[2] = vim.api.nvim_win_get_height(status.results_win)