[MM-49751] - Turn off Inactive Server Email (#22648)

* [MM-49751] - Turn off Inactive Server Email

* remove unused var

---------

Co-authored-by: Mattermost Build <build@mattermost.com>

server/channels/app/email/email_test.go

@@ -408,7 +408,6 @@ func TestMailServiceConfig(t *testing.T) {
 					LoginButtonColor:                  new(string),
 					LoginButtonBorderColor:            new(string),
 					LoginButtonTextColor:              new(string),
-					EnableInactivityEmail:             new(bool),
 				},
 			}
 		},