Revert "feat(#2349): add "right_align" option for renderer.icons.*_placement (#2839)"

This reverts commit 1d629a5d3f.

lua/nvim-tree/renderer/builder.lua

@@ -60,7 +60,6 @@ function Builder:new()
     lines = {},
     markers = {},
     signs = {},
-    extmarks = {},
   }
   setmetatable(o, self)
   self.__index = self
@@ -229,14 +228,6 @@ function Builder:format_line(indent_markers, arrows, icon, name, node)
     add_to_end(line, M.decorators[i]:icons_after(node))
   end
 
-  local rights = {}
-  for i = #M.decorators, 1, -1 do
-    add_to_end(rights, M.decorators[i]:icons_right_align(node))
-  end
-  if #rights > 0 then
-    self.extmarks[self.index] = rights
-  end
-
   return line
 end