Unnecessary base call filter

[al3mart]

FilteredCalls is used as BaseCallFilter for the system pallet. All filtered calls, force_adjust_total_issuance, force_set_balance, force_transfer, and force_unreserve, require Root origin. However, the behavior is that Root origin bypasses all filters, including BaseCallFilter. Therefore those filters do nothing.

Let's remove those unnecessary filters to avoid giving a false sense of security.