stop event_loop before join

Author: workingBanana

core/src/vpn_manager.cpp

@@ -57,6 +57,9 @@ Vpn::Vpn()
 }
 
 Vpn::~Vpn() {
+    if (ev_loop) {
+        vpn_event_loop_stop(ev_loop.get());
+    }
     if (executor_thread.joinable()) {
         executor_thread.join();
     }