Remove LSR variables

[MaxGhenis]

For example ssi_engaged_in_sga shows:

• is_blind
• labor_supply_behavioral_response
• self_employment_income_before_lsr

but here's the tree:

WARNING:root:Parameter gov.states.ct.tax.income.rebate.reduction.start has a child WIDOW that is not in the possible values of filing_status, ignoring.
WARNING:root:Parameter gov.states.ct.tax.income.rebate.reduction.start has a child WIDOW that is not in the possible values of filing_status, ignoring.
============================= test session starts ==============================
platform linux -- Python 3.9.19, pytest-8.2.2, pluggy-1.5.0
rootdir: /mount/src/policyengine-us-variable-leaves
plugins: dependency-0.6.0
collected 1 item

test.yaml Computation log:
  ssi_engaged_in_sga<2024, (default)> = [False]
    ssi_earned_income<2024, (default)> = [0.]
      employment_income<2024, (default)> = [0.]
        employment_income_before_lsr<2024, (default)> = [0.]
        employment_income_behavioral_response<2024, (default)> = [0.]
          labor_supply_behavioral_response<2024, (default)> = [0.]
          employment_income_before_lsr<2024, (default)> = [0.]
          self_employment_income_before_lsr<2024, (default)> = [0.]
      self_employment_income<2024, (default)> = [0.]
        self_employment_income_before_lsr<2024, (default)> = [0.]
        self_employment_income_behavioral_response<2024, (default)> = [0.]
          labor_supply_behavioral_response<2024, (default)> = [0.]
          employment_income_behavioral_response<2024, (default)> = [0.]
    is_blind<2024, (default)> = [False]
.

it should instead stop at employment_income and self_employment_income. might have to hard-code these.