configure_hotkey: Remove unnecessary include

Avoids dumping all of the core settings machinery into whatever files
include this header. Nothing inside the header itself actually made use
of anything in settings.h anyways.

src/citra_qt/configuration/configure_hotkeys.h

@@ -6,7 +6,6 @@
 
 #include <memory>
 #include <QWidget>
-#include "core/settings.h"
 
 namespace Ui {
 class ConfigureHotkeys;