Pass "ShouldUsePinyin" to StringMatcher

Flag is used in method "ShouldUsePinyin()" to avoid calling Alphabet
service. Otherwise, tests applying to StringMatcher.FuzzySearch() would
fail because the pinyin helper library fails to initialize.

Wox/App.xaml.cs

@@ -56,6 +56,7 @@ namespace Wox
                 Alphabet.Initialize(_settings);
 
                 StringMatcher.UserSettingSearchPrecision = _settings.QuerySearchPrecision;
+                StringMatcher.ShouldUsePinyin = _settings.ShouldUsePinyin;
 
                 PluginManager.LoadPlugins(_settings.PluginSettings);
                 _mainVM = new MainViewModel(_settings);