Qt: Ensure CLI backend is attached when submitting commands (fixes #662)

CHANGES

@@ -41,6 +41,7 @@ Bugfixes:
  - GBA BIOS: Fix ArcTan sign in HLE BIOS
  - GBA BIOS: Fix ArcTan2 sign in HLE BIOS (fixes mgba.io/i/689)
  - GBA Video: Don't update background scanline params in mode 0 (fixes mgba.io/i/377)
+ - Qt: Ensure CLI backend is attached when submitting commands (fixes mgba.io/i/662)
 Misc:
  - SDL: Remove scancode key input
  - GBA Video: Clean up unused timers

src/platform/qt/DebuggerConsoleController.cpp

@@ -40,6 +40,7 @@ void DebuggerConsoleController::enterLine(const QString& line) {
 
 void DebuggerConsoleController::attachInternal() {
 	mCore* core = m_gameController->thread()->core;
+	CLIDebuggerAttachBackend(&m_cliDebugger, &m_backend.d);
 	CLIDebuggerAttachSystem(&m_cliDebugger, core->cliDebuggerSystem(core));
 }