python3Packages.privacyidea: fix eval with python3

While `privacyidea-ldap-proxy` only works on `python2`[1], `privacyidea`
itself works fine with `python3`, however it needs version one of
`pyjwt`[2], so I had to add `pyjwt1` which was already packaged for
`python2`[3] to the `python3` package-set. I think that's fine though
since `python2` should be only used when actually needed which isn't the
case here.

Closes #122250

[1] https://github.com/privacyidea/privacyidea-ldap-proxy/issues/50
[2] https://github.com/privacyidea/privacyidea/issues/2629
[3] bf9b6b1ef3

pkgs/top-level/python2-packages.nix

@@ -383,7 +383,7 @@ with self; with super; {
 
   prettytable = callPackage ../development/python-modules/prettytable/1.nix { };
 
-  privacyidea = callPackage ../development/python-modules/privacyidea { };
+  privacyidea-ldap-proxy = callPackage ../development/python-modules/privacyidea/ldap-proxy.nix { };
 
   progressbar231 = callPackage ../development/python-modules/progressbar231 { };