Revert "Make remixing/saving faster by marking all assets as clean to start."

src/lib/vm-manager-hoc.jsx

@@ -53,9 +53,6 @@ const vmManagerHOC = function (WrappedComponent) {
         loadProject () {
             return this.props.vm.loadProject(this.props.projectData)
                 .then(() => {
-                    // Mark all the assets as clean since they just got loaded
-                    this.props.vm.assets.forEach(asset => (asset.clean = true));
-
                     this.props.onLoadedProject(this.props.loadingState, this.props.canSave);
                     // Wrap in a setTimeout because skin loading in
                     // the renderer can be async.