Fix - mapping sometimes landing on wrong filename

Instead of using Lua to search through all buffer lines and match the
file line containing the filename, instead use `search()` and wrap the
filename in word boundry delimiters `\<\>` to always match the whole
filename not a subscript. This also moves the cursor to that position
in the file.

lua/netrw.lua

@@ -18,17 +18,8 @@ vim.keymap.set('n', '-', function()
 
   -- Invoke netrw on the directory containing the current file
   vim.fn.execute(string.format("edit %s", directory))
-
   if filename ~= '' then
     -- In the netrw buffer, move the cursor to the first character of filename
-    local buffer = vim.api.nvim_get_current_buf()
-    local lines = vim.api.nvim_buf_get_lines(buffer, 0, -1, true)
-    for row, content in ipairs(lines) do
-      local column = string.find(content, filename)
-      if column then
-        vim.api.nvim_win_set_cursor(0, { row, column - 1 })
-        break
-      end
-    end
+    vim.fn.search('\\<' .. filename .. '\\>')
   end
 end)