Fix build when kdelibs is not installed.

--- a/mainwindow.cpp
+++ b/mainwindow.cpp
@@ -52,7 +52,7 @@
 
 QStandardItemModel *model;
 
-#include <KDE/KWallet/Wallet>
+#include <KWallet>
 using KWallet::Wallet;
 Wallet *m_wallet;
 QString WalletFolder="Kencfs-Plasma";