PLT-4481 Fix member count for team user lists and channel invite list (#4422)

* Fix member count for team user lists and channel invite list

* Fix client unit test

webapp/tests/client_team.test.jsx

@@ -169,7 +169,7 @@ describe('Client.Team', function() {
             TestHelper.basicClient().getTeamStats(
                 TestHelper.basicTeam().id,
                 function(data) {
-                    assert.equal(data.member_count > 0, true);
+                    assert.equal(data.total_member_count > 0, true);
                     done();
                 },
                 function(err) {