SystemMonitor: Register GraphWidget

Author: https://github.com/kleinesfilmroellchen
Commit: abf2ed4c52
Pull-request: https://github.com/SerenityOS/serenity/pull/13125

Userland/Applications/SystemMonitor/GraphWidget.cpp

@@ -13,6 +13,10 @@
 #include <LibGfx/Path.h>
 #include <LibGfx/SystemTheme.h>
 
+REGISTER_WIDGET(SystemMonitor, GraphWidget)
+
+namespace SystemMonitor {
+
 void GraphWidget::add_value(Vector<u64, 1>&& value)
 {
     m_values.enqueue(move(value));
@@ -143,3 +147,5 @@ void GraphWidget::paint_event(GUI::PaintEvent& event)
         }
     }
 }
+
+}