Clipboard+LibGUI: Remove unnecessary client/server greeting message

Userland/Libraries/LibGUI/Clipboard.cpp

@@ -19,7 +19,6 @@ class ClipboardServerConnection : public IPC::ServerConnection<ClipboardClientEn
 public:
     virtual void handshake() override
     {
-        greet();
     }
 
 private:

Userland/Services/Clipboard/ClientConnection.cpp

@@ -35,10 +35,6 @@ void ClientConnection::die()
     s_connections.remove(client_id());
 }
 
-void ClientConnection::greet()
-{
-}
-
 void ClientConnection::set_clipboard_data(Core::AnonymousBuffer const& data, String const& mime_type, IPC::Dictionary const& metadata)
 {
     Storage::the().set_data(data, mime_type, metadata.entries());

Userland/Services/Clipboard/ClientConnection.h

@@ -28,7 +28,6 @@ public:
     void notify_about_clipboard_change();
 
 private:
-    virtual void greet() override;
     virtual Messages::ClipboardServer::GetClipboardDataResponse get_clipboard_data() override;
     virtual void set_clipboard_data(Core::AnonymousBuffer const&, String const&, IPC::Dictionary const&) override;
 };

Userland/Services/Clipboard/ClipboardServer.ipc

@@ -1,7 +1,5 @@
 endpoint ClipboardServer
 {
-    greet() => ()
-
     get_clipboard_data() => (Core::AnonymousBuffer data, [UTF8] String mime_type, IPC::Dictionary metadata)
     set_clipboard_data(Core::AnonymousBuffer data, [UTF8] String mime_type, IPC::Dictionary metadata) =|
 }