fix namespaces

the namespace Interfaces was wrapping PixbufManipulator
for no apparent reason, removed the wrapping.

Change-Id: I2deb2e35513407777898e1d08712788f2cce97ca
Reviewed-by: Anthony Léonard <anthony.leonard@savoirfairelinux.com>
diff --git a/main.cpp b/main.cpp
index b7d8a18..aad8be2 100644
--- a/main.cpp
+++ b/main.cpp
@@ -68,7 +68,7 @@
 
     QApplication a(argc, argv);
 
-    GlobalInstances::setPixmapManipulator(std::unique_ptr<Interfaces::PixbufManipulator>(new Interfaces::PixbufManipulator()));
+    GlobalInstances::setPixmapManipulator(std::unique_ptr<PixbufManipulator>(new PixbufManipulator()));
 
     auto startMinimized = false;
     QString uri = "";