[kwin] Do not use camelcase includes for kactivities

Jenkins doesn't like them, so let's try without them.

activities.cpp

@@ -23,7 +23,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #include "workspace.h"
 // KDE
 #include <KDE/KConfigGroup>
-#include <KActivities/Controller>
+#include <kactivities/controller.h>
 // Qt
 #include <QtConcurrentRun>
 #include <QDBusInterface>

useractions.cpp

@@ -46,7 +46,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 #ifdef KWIN_BUILD_ACTIVITIES
 #include "activities.h"
-#include <KActivities/Info>
+#include <kactivities/info.h>
 #endif
 
 #include <KDE/KKeySequenceWidget>