Remove empty newlines in #include blocks.

This makes clang-format useful on those.

Also add a bunch of forgotten transitive includes, which otherwise
prevented compilation.

src/citra_qt/configure_system.h

@@ -4,8 +4,8 @@
 
 #pragma once
 
-#include <QWidget>
 #include <memory>
+#include <QWidget>
 
 namespace Ui {
 class ConfigureSystem;