Update systray_linux.c (getlantern#200)

Support setting the title on Linux.

Co-authored-by: Seth Wright <seth@getlantern.org>

Author: cocotyty

systray_linux.c

@@ -222,6 +222,7 @@ void setIcon(const char* iconBytes, int length, bool template) {
 }
 
 void setTitle(char* ctitle) {
+	app_indicator_set_title(global_app_indicator, ctitle);
 	app_indicator_set_label(global_app_indicator, ctitle, "");
 	free(ctitle);
 }