refactor: solver form: remove useless update() code

refs #601

src/app/formulaire/definition/form-solveur.ts

@@ -105,12 +105,6 @@ export class FormulaireSolveur extends FormulaireFixedVar {
                 // refresh parameters selector
                 this.refreshParameterEntries();
             }
-        } else if (sender instanceof ParamDefinition) {
-            if (data.action === "paramdefinitionAfterValue" && sender.symbol === "Ytarget") {
-                if (this.isFirstDisplay && ServiceFactory.applicationSetupService.enableEmptyFieldsOnFormInit) {
-                    sender.setValue(undefined);
-                }
-            }
         }
     }