Fix a bunch of obvious memory leaks at termination

Signed-off-by: Steffen Jaeckel <s@jaeckel.eu>

src/ui/titlebar.h

@@ -37,6 +37,7 @@
 #define UI_TITLEBAR_H
 
 void create_title_bar(void);
+void free_title_bar(void);
 void title_bar_update_virtual(void);
 void title_bar_resize(void);
 void title_bar_console(void);