zotero-beta: fix linux rpath

pkgs/by-name/zo/zotero-beta/package.nix

···
       pciutils
     ]
     + ":"
-    + lib.makeSearchPathOutput "lib" "lib64" [ stdenv.cc.cc ];
+    + lib.makeSearchPathOutput "lib" "lib" [ stdenv.cc.cc ];
 
   desktopItem = makeDesktopItem {
     name = "zotero";