expo: fix gesture crash

Author: vaxerski

hyprexpo/ExpoGesture.cpp

@@ -2,10 +2,16 @@
 
 #include "overview.hpp"
 
+#include <hyprland/src/Compositor.hpp>
+#include <hyprland/src/helpers/Monitor.hpp>
+
 void CExpoGesture::begin(const ITrackpadGesture::STrackpadGestureBegin& e) {
     ITrackpadGesture::begin(e);
 
     m_lastDelta = 0.F;
+
+    if (!g_pOverview)
+        g_pOverview = std::make_unique<COverview>(g_pCompositor->m_lastMonitor->m_activeWorkspace);
 }
 
 void CExpoGesture::update(const ITrackpadGesture::STrackpadGestureUpdate& e) {