Remove arbitrary tab size limit when configuring the current editor

[Janfel]

When configuring the tab size for the current editor, whether using the status bar widget or the command palette, the user is limited to the values 1–8. This causes issues when the user wants to temporarily set the tab size to a large value, or has set a value > 8 in settings.json and wishes to switch tab sizes on the fly.

This restriction appears to be an arbitrary limitation in ChangeIndentationSizeAction. It does not exist when setting editor.tabSize in settings.json and the editor works just fine with values > 8. I would like this limitation to be removed so the user can type in any integer value into the selection box, just like they can set any integer value in settings.json.