sharee does not receive a mail notification when sharer changes permission to a shared resource

[nirajacharya2]

Describe the bug

User does not get mail notification when shared file/folder's permission is changed

Steps to reproduce

Steps to reproduce the behavior:

1. Alice creates a resource textfile.txt
2. share the resource to Brian using command curl -kv -X POST https://localhost:9200/ocs/v1.php/apps/files_sharing/api/v1/shares -d 'shareType=0&path=/testfile.txt&permissions=17&role=viewer&shareWith=brian' -u alice:123456
3. Brian accepts the share
4. Alice changes permission of the resource

curl -kv -X PUT https://localhost:9200/ocs/v1.php/apps/files_sharing/api/v1/shares/<space-id> -d 'permissions=19&role=editor' -u alice:123456

Expected behavior

Brian should receive mail notification when shared file/folder's permission is changed by Alice

Actual behavior

Brian does not receive mail notification when shared file/folder's permission is changed by Alice

Setup

Ocis : latest master

Additional context

Add any other context about the problem here.

[SwikritiT]

the behaviour is same for the project spaces too now

[SwikritiT]

According to #6649 (comment) this comment this is a feature request and not an issue so closing this

cc: @ScharfViktor