Fix build with meson >= 0.60.0

Index: data/appdata/meson.build
--- data/appdata/meson.build.orig
+++ data/appdata/meson.build
@@ -1,7 +1,6 @@
 info = 'org.gnome.Notes.appdata.xml'
 
 i18n.merge_file(
-  info,
   input: info + '.in',
   output: info,
   po_dir: po_dir,