fix: launching obsidian built by nix on macos

modules/darwin/hammerspoon/Spoons/Launcher.spoon/init.lua

@@ -80,7 +80,7 @@ function obj:init()
         self:switch("Messages.app")
     end)
     self.launcher:bind("", "O", function()
-        self:switch("Obsidian.app")
+        self:switch("@obsidian@")
     end)
     self.launcher:bind("", "P", function()
         self:switch("System Preferences.app")