fix compile error by properly installing fontconfig in nix flake

flake.nix

@@ -29,10 +29,10 @@
         rust = pkgs.rust-bin.fromRustupToolchainFile ./rust-toolchain.toml;
 
         libPath = with pkgs; lib.makeLibraryPath [
-          fontconfig.dev
           libxkbcommon
           libGL
           wayland
+          fontconfig
         ];
 
       in
@@ -44,8 +44,9 @@
               buildInputs = [
                 rust
                 cargo-nextest
-                pkg-config
                 fish
+                pkg-config
+                fontconfig
               ];
 
               LD_LIBRARY_PATH = "$LD_LIBRARY_PATH:${libPath}";