PLT-6752/PLT-6755 Fixed users removed from a team counting against max team members (#6578)

* PLT-6752 Fixed users removed from a team counting against max team members

* Updated unit tests for max team members

* Fixed being able to have MaxUserPerTeam+1 users in a team

store/sql_user_store_test.go

@@ -46,7 +46,7 @@ func TestUserStoreSave(t *testing.T) {
 		t.Fatal("should be unique username")
 	}
 
-	for i := 0; i < 50; i++ {
+	for i := 0; i < 49; i++ {
 		u1.Id = ""
 		u1.Email = model.NewId()
 		u1.Username = model.NewId()