weather: Fix property name

It's g-*name*-owner. As the condition covers the unlikely case where
Weather is running before gnome-shell, this slipped through.

js/misc/weather.js

@@ -154,7 +154,7 @@ var WeatherClient = class {
         this._weatherProxy.connect('g-properties-changed',
             this._onWeatherPropertiesChanged.bind(this));
 
-        if (this._weatherProxy.g_owner != null)
+        if (this._weatherProxy.g_name_owner != null)
             this._onWeatherPropertiesChanged();
     }