drm: ensure disconnect called for removed connectors (#215)

Originally disconnected monitors were not removed from hyprland
correctly and duplications were created when an external monitor was
reattached leading to invalid behavior when switching
(empty desktop is visible).

Now removed monitors are explicitly disconnected during connectors
scanning.

Author: jsierant

src/backend/drm/DRM.cpp

@@ -847,12 +847,12 @@ void Aquamarine::CDRMBackend::scanConnectors() {
     }
 
     // cleanup hot unplugged connectors
-    std::erase_if(connectors, [resources](const auto& conn) {
+    std::erase_if(connectors, [resources](auto& conn) {
         for (int i = 0; i < resources->count_connectors; ++i) {
             if (resources->connectors[i] == conn->id)
                 return false;
         }
-
+        conn->disconnect();
         return true;
     });