Trade: don't use deprecated Corrade functionality in deprecated code.

This would fail to build when Corrade is built w/o deprecated APIs but
Magnum is with. Rare case, but I just hit it while testing, so I guess
it's valid.

src/Magnum/Trade/PhongMaterialData.cpp

@@ -93,7 +93,7 @@ PhongMaterialData::PhongMaterialData(const Flags flags, const Color4& ambientCol
 
     /* Convert back to a non-growable Array as importers don't allow custom
        deleters in plugin implementations */
-    arrayShrink(data, Containers::DefaultInit);
+    arrayShrink(data, DefaultInit);
     return data;
 }(), importerState} {
     /* The data can't be filled here because it won't be sorted correctly */