fixed some spacing issues

src/separator.typ

@@ -10,6 +10,7 @@
 
 #let render(x-pos, elmt, y) = {
   let shapes = ()
+  y -= Y-SPACE
 
   let x0 = x-pos.first() - 20
   let x1 = x-pos.last() + 20
@@ -48,7 +49,6 @@
     fill: COL-SEP-NAME
   )
   y -= h / 2
-  y -= Y-SPACE
 
   let r = (y, shapes)
   return r