LV2 Host: Add missing path separator to UI bundle path

modules/juce_audio_processors/format_types/juce_LV2PluginFormat.cpp

@@ -2676,7 +2676,7 @@ private:
 
         return Instance { descriptor->get()->instantiate (descriptor->get(),
                                                           pluginUri.toString (false).toRawUTF8(),
-                                                          bundlePath.getFullPathName().toRawUTF8(),
+                                                          File::addTrailingSeparator (bundlePath.getFullPathName()).toRawUTF8(),
                                                           writeFunction,
                                                           this,
                                                           &widget,