Do not include namespace for Granite style classes

Author: stsdc

src/Views/SystemView/SystemStorageView.vala

@@ -93,7 +93,7 @@ public class Monitor.SystemStorageView : Gtk.Box {
 
         construct {
             var drive_name_label = new Granite.HeaderLabel (drive.model) {
-                size = Granite.HeaderLabel.Size.H3
+                size = H3
             };
 
             string size_string = format_size ((uint64) drive.size, IEC_UNITS);

src/Widgets/WidgetResource/WidgetResource.vala

@@ -40,7 +40,7 @@ public class Monitor.WidgetResource : Gtk.Box {
         main_metric_title.add_css_class (Granite.CssClass.SMALL);
 
         main_metric_label = new Granite.HeaderLabel (Utils.NO_DATA) {
-            size = Granite.HeaderLabel.Size.H2
+            size = H2
         };
 
         var main_metric_box = new Gtk.Box (VERTICAL, 0) {