feat: simplify flake.nix

overlays/default.nix

@@ -1,7 +1,9 @@
 args:
 # execute and import all overlay files in the current directory with the given args
 builtins.map
-  (f: (import (./. + "/${f}") args))  # execute and import the overlay file
-  (builtins.filter          # find all overlay files in the current directory
-    (f: f != "default.nix")
-    (builtins.attrNames (builtins.readDir ./.)))
+(f: (import (./. + "/${f}") args)) # execute and import the overlay file
+
+(builtins.filter # find all overlay files in the current directory
+  
+  (f: f != "default.nix")
+  (builtins.attrNames (builtins.readDir ./.)))

overlays/fcitx5/default.nix

@@ -1,12 +1,10 @@
 # 为了不使用默认的 rime-data，改用我自定义的小鹤音形数据，这里需要 override
 # 参考 https://github.com/NixOS/nixpkgs/blob/e4246ae1e7f78b7087dce9c9da10d28d3725025f/pkgs/tools/inputmethods/fcitx5/fcitx5-rime.nix
-{ ... }:
-
-(self: super: {
+{...}: (self: super: {
   # 小鹤音形配置，配置来自 flypy.com 官方网盘的鼠须管配置压缩包「小鹤音形“鼠须管”for macOS.zip」
   # 我仅修改了 default.yaml 文件，将其中的半角括号改为了直角括号「 与 」。
   rime-data = ./rime-data-flypy;
-  fcitx5-rime = super.fcitx5-rime.override { rimeDataPkgs = [ ./rime-data-flypy ]; };
+  fcitx5-rime = super.fcitx5-rime.override {rimeDataPkgs = [./rime-data-flypy];};
 
   # used by macOS Squirrel
   flypy-squirrel = ./rime-data-flypy;