LibIPC: Remove socket path from IPC Client connections

We don't need these for Ladybird, and they are the only users of
some LibCore functions we can remove as well.

Libraries/LibImageDecoderClient/Client.h

@@ -29,7 +29,7 @@ struct DecodedImage {
 class Client final
     : public IPC::ConnectionToServer<ImageDecoderClientEndpoint, ImageDecoderServerEndpoint>
     , public ImageDecoderClientEndpoint {
-    IPC_CLIENT_CONNECTION(Client, "/tmp/session/%sid/portal/image"sv);
+    C_OBJECT_ABSTRACT(Client);
 
 public:
     Client(IPC::Transport);