change fcitx5 config to pkg, use rime-ice default config.

pkgs/default.nix

@@ -11,5 +11,14 @@
   let
     nur-xddxdd = (pkgs.callPackage "${inputs.nur-xddxdd}/default.nix" { });
   in
-  pkgs.lib.genAttrs [ "rime-ice" "rime-zhwiki" "rime-moegirl" ] (name: nur-xddxdd."${name}")
+  pkgs.lib.genAttrs [ "rime-zhwiki" "rime-moegirl" ] (name: nur-xddxdd."${name}")
+  // {
+    rime-ice = nur-xddxdd.rime-ice.overrideAttrs {
+      buildPhase = ''
+        runHook preBuild
+
+        runHook postBuild
+      '';
+    };
+  }
 )