Corrected recipient email address in reported PM Slack notification - fixes #12256 (#12838)

* Corrected recipient email address in reported PM Slack notification

Corrected the recipient email address in the Slack notification sent to moderators when a user reports their own private message.

* Installed new dependencies

* Removed personal comments

Co-authored-by: Matteo Pagliazzi <matteopagliazzi@gmail.com>

package-lock.json

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@@ -13085,8 +13080,7 @@
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