keybinds: Fix exit trigger by moving it to monitor.frame (#5240)

src/Compositor.hpp

@@ -118,6 +118,7 @@ class CCompositor {
     bool                                      m_bUnsafeState    = false;   // unsafe state is when there is no monitors.
     bool                                      m_bNextIsUnsafe   = false;   // because wlroots
     CMonitor*                                 m_pUnsafeOutput   = nullptr; // fallback output for the unsafe state
+    bool                                      m_bExitTriggered = false;    // For exit dispatcher
     bool                                      m_bIsShuttingDown = false;
 
     // ------------------------------------------------- //