filebrowser: revert parts of previous commit, selection.js produces errors

vispa/extensions/file/static/js/base/selections.js

@@ -89,7 +89,7 @@ var FileBaseSelections = Class.extend({
     var offsetSelected = null;
     var y = 0;
     var lastSelectedNode = this.lastSelectedNode;
-    var contentContainer = $(".file-node", this.FileBase.view.fileContentContainer);
+    var contentContainer = $(".file-view-content-container", this.FileBase.view.fileContentContainer);
     var offsetMain = this.FileBase.view.fileContentContainer.offset().top;
     if (lastSelectedNode === null || number === 0) {
       selectNode = contentContainer.children().first();