change variables d'input pour les retraites

.../test_cases/02_couple_retraites_pension_1.33_SMIC_d2.json

custom/test_cases/02_couple_retraites_pension_2_SMIC_d5.json

...m/test_cases/02_couple_retraites_pension_3.1_SMIC_d8.json

custom/test_cases/Z_couple_marie_retraites_3.8_smic_d9.json

...om/test_cases/Z_couple_retraites_pension_1.5_SMIC_d3.json

...om/test_cases/Z_couple_retraites_pension_1.7_SMIC_d4.json

...om/test_cases/Z_couple_retraites_pension_2.3_SMIC_d6.json

...om/test_cases/Z_couple_retraites_pension_2.6_SMIC_d7.json

.../test_cases/aspa_01_retraite_pension_sous_plafond_d1.json

..._02_couple_retraites_1pension_moyenne_1_sans_pension.json

custom/test_cases/celibataire_retraite_1.2_SMIC_d4.json

custom/test_cases/celibataire_retraite_1.4_SMIC_d5.json

custom/test_cases/celibataire_retraite_1.6_SMIC_d6.json

...m/test_cases/csg_retraite_01_retraite_taux_reduit_d2.json

...m/test_cases/csg_retraite_02_retraite_taux_médian_d3.json

custom/test_cases/csg_retraite_03_taux_plein_d7.json