Discussion counter is wrong on issue page
### Steps to reproduce - Open any issue with system notes. ### Example Project https://gitlab.com/gitlab-org/gitlab-ce/issues/58790 ### What is the current *bug* behavior? The counter shown is much higher than the number of comments. It probably includes the number of system notes: ![Screen_Shot_2019-08-07_at_20.36.11](/uploads/e76021d7522926e1deaba6b92d105628/Screen_Shot_2019-08-07_at_20.36.11.png) ### What is the expected *correct* behavior? Only the number of comments is shown.
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