removed deprecated method in manifolds

<div id="comment:0"></div>

after #18640

CC:  @tscrim

Component: **geometry**

Author: **Frédéric Chapoton**

Branch/Commit: **[`159e9c1`](https://github.com/sagemath/sagetrac-mirror/commit/159e9c1e0b2a64fa33aa1d2d9ef8b06e752bbc6f)**

Reviewer: **Travis Scrimshaw**

_Issue created by migration from https://trac.sagemath.org/ticket/27409_

