impr: Improve plugin unload logging

lib/libimhex/source/api/plugin_manager.cpp

@@ -260,6 +260,11 @@ namespace hex {
         auto &plugins = getPlugins();
         const auto pluginCount = plugins.size();
         for (size_t i = 0; i < pluginCount; i++) {
+            auto &plugin = plugins[pluginCount - 1 - i];
+            if (plugin.isLoaded()) {
+                log::info("Trying to unload plugin '{}'", plugin.getPluginName());
+            }
+
             plugins.pop_back();
         }
     }