Ignore non dispatchable items when refreshing a view

[Luc1412]

Summary

The pull request fixes #41 by ignoring non-dispatchable items when refreshing a view.

Context

When view.refresh() is called it can't find the component in https://github.com/Dorukyum/pycord/blob/master/discord/ui/view.py#L400
This causes the re-creation of that item with no row assigned. This causes the item to get moved in row 0.

Checklist

• If code changes were made then they have been tested.
  • I have updated the documentation to reflect the changes.
• This PR fixes an issue.
• This PR adds something new (e.g. new method or parameters).
• This PR is a breaking change (e.g. methods or parameters removed/renamed)
• This PR is not a code change (e.g. documentation, README, ...)