Adjust test suite for typst template changes.

Note: the new templates presuppose typst 0.12; if you try to
use an earlier version of typst, an error will be raised.

data/templates/template.typst

@@ -84,5 +84,5 @@
   }
   ]
 
-doc
+  doc
 }

test/writer.typst

@@ -65,15 +65,17 @@
     paper: paper,
     margin: margin,
     numbering: "1",
-  )
+    columns: cols,
+    )
   set par(justify: true)
   set text(lang: lang,
            region: region,
            font: font,
            size: fontsize)
   set heading(numbering: sectionnumbering)
 
-  if title != none {
+  place(top, float: true, scope: "parent", clearance: 4mm)[
+  #if title != none {
     align(center)[#block(inset: 2em)[
       #text(weight: "bold", size: 1.5em)[#title]
       #(if subtitle != none {
@@ -83,7 +85,7 @@
     ]]
   }
 
-  if authors != none and authors != [] {
+  #if authors != none and authors != [] {
     let count = authors.len()
     let ncols = calc.min(count, 3)
     grid(
@@ -99,23 +101,20 @@
     )
   }
 
-  if date != none {
+  #if date != none {
     align(center)[#block(inset: 1em)[
       #date
     ]]
   }
 
-  if abstract != none {
+  #if abstract != none {
     block(inset: 2em)[
     #text(weight: "semibold")[Abstract] #h(1em) #abstract
     ]
   }
+  ]
 
-  if cols == 1 {
-    doc
-  } else {
-    columns(cols, doc)
-  }
+  doc
 }
 #show: doc => conf(
   title: [Pandoc Test Suite],