libfic/mcq: remove Kind, as we can only handle checkbox; another kind of record should be created to handle select/radio

libfic/db.go

@@ -147,7 +147,6 @@ CREATE TABLE IF NOT EXISTS exercice_mcq(
   id_mcq INTEGER NOT NULL PRIMARY KEY AUTO_INCREMENT,
   id_exercice INTEGER NOT NULL,
   title VARCHAR(255) NOT NULL,
-  kind ENUM('checkbox', 'radio', 'select') NOT NULL,
   FOREIGN KEY(id_exercice) REFERENCES exercices(id_exercice)
 );
 `); err != nil {