ConTeXt template: Adjustments to title formatting (#5949)

Added `\setupinterlinespace` to `title`, `subtitle`, `date` and `author` elements.
Otherwise longer titles that run over multiple lines will look squashed as
`\tfd` etc. won't adapt the line spacing to the font size.

data/templates/default.context

@@ -133,18 +133,18 @@ $endfor$
 \starttext
 $if(title)$
 \startalignment[middle]
-  {\tfd $title$}
+  {\tfd\setupinterlinespace $title$}
 $if(subtitle)$
   \smallskip
-  {\tfa $subtitle$}
+  {\tfa\setupinterlinespace $subtitle$}
 $endif$
 $if(author)$
   \smallskip
-  {\tfa $for(author)$$author$$sep$\crlf $endfor$}
+  {\tfa\setupinterlinespace $for(author)$$author$$sep$\crlf $endfor$}
 $endif$
 $if(date)$
   \smallskip
-  {\tfa $date$}
+  {\tfa\setupinterlinespace $date$}
 $endif$
   \bigskip
 \stopalignment

test/writer.context

@@ -61,11 +61,11 @@
 
 \starttext
 \startalignment[middle]
-  {\tfd Pandoc Test Suite}
+  {\tfd\setupinterlinespace Pandoc Test Suite}
   \smallskip
-  {\tfa John MacFarlane\crlf Anonymous}
+  {\tfa\setupinterlinespace John MacFarlane\crlf Anonymous}
   \smallskip
-  {\tfa July 17, 2006}
+  {\tfa\setupinterlinespace July 17, 2006}
   \bigskip
 \stopalignment