chor: increase the blur so we cant see the words

Author: tyboro2002

frontend/src/components/quiz_question_types/ListKeywordsQuestion.vue

@@ -246,7 +246,7 @@ const isRevealed = (keyword: string) => {
 }
 
 .blurred {
-  filter: blur(4px);
+  filter: blur(10px);
   user-select: none;
 }