Ensure root template contents is parsed in block mode

Embarrassingly, the double blank lines at the end of the tiddler are needed to ensure the transclude widget is recognised in block mode, instead of being wrapped in a paragraph tag.

Fixes #5016

core/ui/RootTemplate.tid

@@ -1,3 +1,4 @@
 title: $:/core/ui/RootTemplate
 
-<$transclude tiddler={{{ [{$:/layout}has[text]] ~[[$:/core/ui/PageTemplate]] }}} mode="inline"/>
+<$transclude tiddler={{{ [{$:/layout}has[text]] ~[[$:/core/ui/PageTemplate]] }}} mode="inline"/>
+