Status message on Manage enrollments actions reports wrong number of operations

Problem/Motivation

Status message on Manage enrollments actions reports wrong number of operations

Steps to reproduce

- Create clean install of open social
- Create an event
- Enroll any number of users to newly created event
- As sitemanager, go to "Manage enrollments" tab on newly created event
- Select X number of enrollees and execute an action (for example: "Remove selected enrollees")
- Once action is successfully completed, you will see the message "2 selected enrollees have been removed from the event successfully" instead of "X selected enrollees have been removed from the event successfully"

Proposed resolution

Fix the issue introduced in https://github.com/goalgorilla/open_social/commit/cad316d3c661b099945851...

Remaining tasks

N/A

User interface changes

N/A

API changes

N/A

Data model changes

N/A