root buttons compatibility for shadow tiddlers

[bepuzzled]

Hi Saq, as requested.

The filter expression for root buttons in $:/plugins/sq/streams/nodes-list-template is as follows:

<$list filter="[tag[$:/tags/streams/root-buttons]]" variable="btnTiddler">
	<div class="stream-node-handle">
		<$transclude tiddler=<<btnTiddler>>/>
	</div>
</$list>

The current filter expression prevents tiddlers with the correct $:/tags/streams/root-buttons tag to be displayed if they are bundled inside plugins (shadow tiddlers).

Recommend the filter expression be changed as follows:

<$list filter="[all[shadows+tiddlers]tag[$:/tags/streams/root-buttons]]" variable="btnTiddler">
	<div class="stream-node-handle">
		<$transclude tiddler=<<btnTiddler>>/>
	</div>
</$list>

Reference discussion: https://groups.google.com/g/tiddlywiki/c/-xTFWPwzq6g