Group name is only taken from invite link even after edit

[Wurzelkoch]

Steps to reproduce:

1. Alice creates a group called groupname1 and an invite link to the group
2. Alice changes the group name to groupname2
3. Bob joins the group via the invite link

Expected behaviour:

The group name displayed is groupname2 for both members.

Actual behaviour:

The group name displayed is groupname2 for Alice and groupname1 for Bob.

Affected version:

Delta Chat Desktop 1.46.1 (git: v1.33.0-881-g899f196d)
Delta Chat Core v1.140.2