owncloud-client: unbreak build

By reusing the nextcloud patch to find the "Sql" module (Qt5Sql).

https://hydra.nixos.org/build/64533236/nixlog/1/tail

pkgs/applications/networking/owncloud-client/default.nix

@@ -9,6 +9,8 @@ stdenv.mkDerivation rec {
     sha256 = "1r5ddln1wc9iyjizgqb104i0r6qhzsmm2wdnxfaif119cv0vphda";
   };
 
+  patches = [ ../nextcloud-client/find-sql.patch ];
+
   nativeBuildInputs = [ pkgconfig cmake ];
   buildInputs = [ qtbase qtwebkit qtkeychain sqlite ];