gui: Set tab size and runtime on startup

This used to happen by itself, but changing the order of how tabs are
initialized broke this.

Signed-off-by: Anna Schumaker <Anna@OcarinaProject.net>

gui/tabs.cpp

@@ -59,6 +59,9 @@ void Tab :: tab_finish_init()
 		columns[i]->signal_clicked().connect(sigc::bind<unsigned int> (
 			sigc::mem_fun(*this, &Tab::on_column_clicked), i));
 	}
+
+	tab_set_size();
+	tab_runtime_changed();
 }