Fix spacing

modules/firefox.nix

@@ -5,6 +5,7 @@ with lib;
 with lib.types;
 let
   cfg = config.modules.firefox;
+  
   myFirefox = pkgs.writeShellScriptBin "firefox" ''
     HOME=~/.local/share/mozilla ${pkgs.firefox-bin}/bin/firefox
   '';

shells/dart.nix

@@ -8,6 +8,7 @@ mkShell {
     flutter
   ];
   shellHook = ''
-    FLUTTER_SDK_DIR=${flutter}/bin/cache/dart-sdk/
+    export FLUTTER_SDK_DIR=${flutter}/bin/cache/dart-sdk/
+    export PATH="$HOME/.pub-cache/bin":"$PATH"
   '';
 }