[scheduler] Remove a workaround for a fixed LUCI Config bug.
[scheduler] Remove a workaround for a fixed LUCI Config bug.

R=tandrii@chromium.org

Change-Id: I0f00e95d1273b3b7173957f8ac28af9ed5151623
Reviewed-on: https://chromium-review.googlesource.com/c/infra/luci/luci-go/+/3064838
Reviewed-by: Andrii Shyshkalov <a30c74fa30536fe7ea81ed6dec202e35e149e1fd@google.com>
Commit-Queue: Vadim Shtayura <9f116ddb1b24f6fc1916a676eb17161b6c07dfc1@chromium.org>

luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go