fix: dock being shown was blocking alt-tab

alt-tab-macos/api-wrappers/CGWindow.swift

@@ -11,7 +11,7 @@ extension CGWindow {
     static func isMissionControlActive() -> Bool {
         // when Mission Control is active, the Dock process spawns some windows. We observe this side-effect and infer
         for window in windows(.optionOnScreenOnly) {
-            guard window.ownerName() == "Dock" else { continue }
+            guard window.ownerName() == "Dock", window.title() == nil else { continue }
             return true
         }
         return false