Fix CharacterMap::Load always returning false #2349

CharacterMap::Load was always returning false, causing a problem on Entity::Load mainly.

Source/Urho3D/Urho2D/SpriterData2D.cpp

@@ -220,7 +220,7 @@ bool CharacterMap::Load(const pugi::xml_node& node)
             return false;
     }
 
-    return false;
+    return true;
 }
 
 bool MapInstruction::Load(const pugi::xml_node& node)