[MODERATION] cope with shared fixtures

* There is one more issue in the fixtures and this breaks some tests
* The users in the shared fixtures were renamed for clarity and that
  breaks some tests

(cherry picked from commit 707a4edbdf)

Conflicts:
	modules/indexer/issues/indexer_test.go
	https://codeberg.org/forgejo/forgejo/pulls/1508

models/issues/issue_test.go

@@ -405,7 +405,7 @@ func TestCountIssues(t *testing.T) {
 	assert.NoError(t, unittest.PrepareTestDatabase())
 	count, err := issues_model.CountIssues(db.DefaultContext, &issues_model.IssuesOptions{})
 	assert.NoError(t, err)
-	assert.EqualValues(t, 20, count)
+	assert.EqualValues(t, 21, count)
 }
 
 func TestIssueLoadAttributes(t *testing.T) {