notes-up: use older vala to fix build

Looks unresolved upstream:
https://github.com/Philip-Scott/Notes-up/issues/349

pkgs/applications/office/notes-up/default.nix

@@ -2,7 +2,7 @@
 , fetchFromGitHub
 , pantheon
 , pkgconfig
-, vala
+, vala_0_46
 , cmake
 , ninja
 , gtk3
@@ -30,7 +30,8 @@ stdenv.mkDerivation rec {
   nativeBuildInputs = [
     cmake
     ninja
-    vala
+    # fails with newer vala: https://github.com/Philip-Scott/Notes-up/issues/349
+    vala_0_46
     pkgconfig
     wrapGAppsHook
   ];
@@ -59,7 +60,7 @@ stdenv.mkDerivation rec {
   meta = with stdenv.lib; {
     description = "Markdown notes editor and manager designed for elementary OS"
     + stdenv.lib.optionalString withPantheon " - built with Contractor support";
-    homepage = https://github.com/Philip-Scott/Notes-up;
+    homepage = "https://github.com/Philip-Scott/Notes-up";
     license = licenses.gpl2;
     maintainers = with maintainers; [ davidak worldofpeace ];
     platforms = platforms.linux;