DolphinWX: Fix items vanishing from toolbar

Commit 33487ab5f2 introduced a regression
where items would vanish from the toolbar. This adds a call to Realize()
after the reinsertions of the play/pause button as required per
documentation.

Thanks to Simonwayneee for noticing this!

Source/Core/DolphinWX/FrameTools.cpp

@@ -1804,6 +1804,7 @@ void CFrame::UpdateGUI()
 				m_ToolBar->InsertTool(position, IDM_PLAY, _("Play"), m_Bitmaps[Toolbar_Play],
 				                      wxNullBitmap, wxITEM_NORMAL, _("Play"));
 			}
+			m_ToolBar->Realize();
 		}
 	}