[gdb] fix conn state to use same pipe (instead of a copy) (#4339)

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I was trying to use GDB stub to investigate MHR and it was not connecting.
Error was suggesting it was not available for connection although i saw it booting on logs.
Debugged and noticed signal_pipe_ was not the correct one, and followed the example of client_socket_.
GDB stub is now working,  on windows, at least.

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/4339
Reviewed-by: Lizzie and Samuel <lizzie@eden-emu.dev>
Reviewed-by: MaranBr <maranbr@eden-emu.dev>

src/core/debugger/debugger.cpp

@@ -358,7 +358,7 @@ private:
 
         ConnectionState(boost::asio::ip::tcp::socket&& client_socket_, async_pipe signal_pipe_, Kernel::KernelCore& kernel)
             : client_socket{std::move(client_socket_)}
-            , signal_pipe{signal_pipe_}
+            , signal_pipe{std::move(signal_pipe_)}
             , active_thread{kernel, nullptr}
         {}