[rkward] rkward/windows: Another missing include

[Thomas Friedrichsmeier]

Git commit ed5aa2cc8b1b0d2fef8e99e658186341c4ecabd3 by Thomas Friedrichsmeier.
Committed on 16/01/2020 at 17:19.
Pushed by tfry into branch 'master'.

Another missing include

M  +1    -0    rkward/windows/rkworkplace.cpp

https://commits.kde.org/rkward/ed5aa2cc8b1b0d2fef8e99e658186341c4ecabd3

diff --git a/rkward/windows/rkworkplace.cpp b/rkward/windows/rkworkplace.cpp
index d2670b76..84bff54b 100644
--- a/rkward/windows/rkworkplace.cpp
+++ b/rkward/windows/rkworkplace.cpp
@@ -32,6 +32,7 @@
 #include <QApplication>
 #include <QMimeDatabase>
 #include <QVBoxLayout>
+#include <QHBoxLayout>
 
 #include "detachedwindowcontainer.h"
 #include "rkcommandeditorwindow.h"