Refactor: remove unnecessary formation field

Author: rabii-chaarani

loopstructural/processing/algorithms/extract_basal_contacts.py

@@ -81,17 +81,6 @@ def initAlgorithm(self, config: Optional[dict[str, Any]] = None) -> None:
             )
         )
 
-        self.addParameter(
-            QgsProcessingParameterField(
-                'FORMATION_FIELD',
-                'Formation Field',
-                parentLayerParameterName=self.INPUT_GEOLOGY,
-                type=QgsProcessingParameterField.String,
-                defaultValue='formation',
-                optional=True
-            )
-        )
-
         self.addParameter(
             QgsProcessingParameterFeatureSource(
                 self.INPUT_FAULTS,