Fix GetPage on section/bundle name overlaps

In the internal Radix we stored the directory based nodes without a traling slash, e.g. `/blog`.

The original motivation was probably to make it easy to do prefix searching: Give me all ancestors.

This, however have lead to some ambigouty with overlapping directory names.

This particular problem was, however, not possible to work around in an easy way, so from now we store these as `/blog/`.

Fixes #7301

helpers/path.go

@@ -665,3 +665,12 @@ func FileContainsAny(filename string, subslices [][]byte, fs afero.Fs) (bool, er
 func Exists(path string, fs afero.Fs) (bool, error) {
 	return afero.Exists(fs, path)
 }
+
+// AddTrailingSlash adds a trailing Unix styled slash (/) if not already
+// there.
+func AddTrailingSlash(path string) string {
+	if !strings.HasSuffix(path, "/") {
+		path += "/"
+	}
+	return path
+}