Fix nested folder bug

In the right-hand pane, two folders that were at the same path and whose
names started with the same characters were considered to be nested by
the breadcrumbs trail.

E.g, folders named "abc" and "abcd", both in the "Audio" folder:
clicking on "abcd" made the breadcrumb trail display "[Audio] > [abc] >
[abcd]"

src/gui/UBFeaturesWidget.cpp

@@ -1465,7 +1465,10 @@ bool UBFeaturesPathProxyModel::filterAcceptsRow( int sourceRow, const QModelInde
     QModelIndex index = sourceModel()->index(sourceRow, 0, sourceParent);
     UBFeature feature = sourceModel()->data(index, Qt::UserRole + 1).value<UBFeature>();
 
-    return feature.isFolder() && path.startsWith( feature.getFullVirtualPath()) ;
+    // We want to display parent folders up to and including the current one
+    return (feature.isFolder()
+            && ( path.startsWith(feature.getFullVirtualPath() + "/")
+                 || path == feature.getFullVirtualPath()));
 
 }