IPCCompiler+WindowServer: Fix deleted function warning

It might be the case that we are passing non-movable/non-copyable things
through IPC. In this case, Clang will emit a warning as it can't
generate the requested default move/copy ctor for the IPC message.

To fix this, we use a `#pragma` to make the compiler silently ignore our
request.

The same was the case with the three-way comparison in `Screen`. Since
we don't use the three-way comparison operator anywhere else in our
codebase, we simply use the `==` operator instead.

Userland/Services/WindowServer/ScreenLayout.h

@@ -28,7 +28,7 @@ public:
             return { location, { resolution.width() / scale_factor, resolution.height() / scale_factor } };
         }
 
-        auto operator<=>(const Screen&) const = default;
+        bool operator==(const Screen&) const = default;
     };
 
     Vector<Screen> screens;