Fix: scriptsFinder crashes if event based hook removes a plugin

getAllPluginsHookScriptFiles was using the list of plugins from opts.plugins
which becomes outdated if an events based hook removes a plugin. The function
was failing while trying to create PluginInfo('dir/of/deleted.plugin') with:

Error: Could not find plugin info in .../tstApp/plugins/org.apache.cordova.engine.crosswalk