fixed wrong hook name

In b90e4f5635a1678f036e57ce941a6176ad7849d0, the "after_core_body" hook has been introduced,
in alignment with the "after_chart_body" hook, which already existed. Shortly after, in
59579bc6d9f5ed3fcb86e7f2585e807f419da19d, the hooks have been renamed to follow the
*_after_body pattern, but the reference in this template was left over.

To stay compatible with existing code, we now run both hooks in succession. In 2.x, the wrong
one will be removed.
Merge branch 'hotfix/after_body'