libsForQt5.fcitx5-qt: add missing callPackage, fixes eval
libsForQt5.fcitx5-qt: add missing callPackage, fixes eval

https://github.com/NixOS/nixpkgs/pull/102168 moved Qt imports to qt5-packages.nix
and https://github.com/NixOS/nixpkgs/pull/104658 added a new package on the old
location.

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