nextcloud-client: fix qt error at startup

The QT_PLUGIN_PATH couldn't find the needed xcb plugin.

See also #51044

(cherry picked from commit b525493)

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

@@ -13,7 +13,7 @@ stdenv.mkDerivation rec {
     fetchSubmodules = true;
   };
 
-  nativeBuildInputs = [ pkgconfig cmake ];
+  nativeBuildInputs = [ pkgconfig cmake makeWrapper ];
 
   buildInputs = [ qtbase qtwebkit qtkeychain qttools qtwebengine sqlite openssl_1_1_0.out pcre inotify-tools ];
 
@@ -33,6 +33,9 @@ stdenv.mkDerivation rec {
   postInstall = ''
     sed -i 's/\(Icon.*\)=nextcloud/\1=Nextcloud/g' \
       $out/share/applications/nextcloud.desktop
+
+    wrapProgram "$out/bin/nextcloud" \
+      --prefix QT_PLUGIN_PATH : ${qtbase}/${qtbase.qtPluginPrefix}
   '';
 
   meta = with stdenv.lib; {