Lua: Apply prefs when reload Lua plugins

Change-Id: I9003fd8c4eb52a868ad88b7ea00b6cf0e70e5c90
Reviewed-on: https://code.wireshark.org/review/14440
Reviewed-by: Stig Bjørlykke <stig@bjorlykke.org>

ui/qt/main_window_slots.cpp

@@ -1455,6 +1455,7 @@ void MainWindow::reloadLuaPlugins()
     char *gdp_path, *dp_path;
     wsApp->readConfigurationFiles(&gdp_path, &dp_path, true);
 
+    prefs_apply_all();
     fieldsChanged();
     redissectPackets();