Revert "choice argument type"

This reverts commit 679bb538cb.

commands/games/typing-test.js

@@ -24,8 +24,12 @@ module.exports = class TypingTestCommand extends Command {
 				{
 					key: 'difficulty',
 					prompt: `What should the difficulty of the game be? Either ${list(difficulties, 'or')}.`,
-					type: 'choice',
-					choices: difficulties
+					type: 'string',
+					validate: difficulty => {
+						if (difficulties.includes(difficulty.toLowerCase())) return true;
+						return `Invalid difficulty, please enter either ${list(difficulties, 'or')}.`;
+					},
+					parse: difficulty => difficulty.toLowerCase()
 				}
 			]
 		});