fix: incorrect field name

Author: lachlangrose

loopstructural/gui/map2loop_tools/thickness_calculator_widget.py

@@ -202,7 +202,7 @@ def _run_calculator(self):
                 'structure': self.structureLayerComboBox.currentLayer(),
                 'calculator_type': calculator_type,
                 'unit_name_field': self.unitNameFieldComboBox.currentField(),
-                'basal_unit_name_field': self.basalUnitNameFieldComboBox.currentField(),
+                'basal_contacts_unit_name': self.basalUnitNameFieldComboBox.currentField(),
                 'dip_field': self.dipFieldComboBox.currentField(),
                 'dipdir_field': self.dipDirFieldComboBox.currentField(),
                 'orientation_type': self.orientationTypeComboBox.currentText(),