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/debugger/registers.h

@@ -2,9 +2,8 @@
 // Licensed under GPLv2 or any later version
 // Refer to the license.txt file included.
 
-#include "ui_registers.h"
-
 #include <QDockWidget>
+#include "ui_registers.h"
 
 class QTreeWidget;
 class QTreeWidgetItem;