Fix some includes

Remove the unneeded KService includes and add the actually needed ones

src/autotests/TerminalInterfaceTest.cpp

@@ -16,7 +16,8 @@
 #include <QDebug>
 
 // KDE
-#include <KService>
+#include <KPluginFactory>
+#include <KPluginLoader>
 #include <qtest.h>
 
 using namespace Konsole;

src/pluginsystem/PluginManager.cpp

@@ -10,6 +10,7 @@
 #include "IKonsolePlugin.h"
 #include "MainWindow.h"
 
+#include <KPluginLoader>
 #include <KPluginMetaData>
 
 namespace Konsole {

src/pluginsystem/PluginManager.h

@@ -13,7 +13,6 @@
 #include <QList>
 
 #include <memory>
-#include <KService>
 #include "konsole_export.h"
 
 namespace Konsole {