fix: Improves statements for quiz questions. (#220)

src/transformer/events/mod_quiz/question_answered/essay.php

...ansformer/events/mod_quiz/question_answered/gapselect.php

src/transformer/events/mod_quiz/question_answered/match.php

...sformer/events/mod_quiz/question_answered/multichoice.php

...ansformer/events/mod_quiz/question_answered/numerical.php

...ormer/events/mod_quiz/question_answered/randomsamatch.php

...sformer/events/mod_quiz/question_answered/shortanswer.php

...ansformer/events/mod_quiz/question_answered/truefalse.php

src/transformer/utils/get_quiz_question_id.php

tests/mod_quiz/attempt_submitted/essay/data.json

tests/mod_quiz/attempt_submitted/essay/statements.json

tests/mod_quiz/attempt_submitted/gapselect/data.json

tests/mod_quiz/attempt_submitted/gapselect/statements.json

tests/mod_quiz/attempt_submitted/match/data.json

tests/mod_quiz/attempt_submitted/match/statements.json

tests/mod_quiz/attempt_submitted/multichoice/data.json

tests/mod_quiz/attempt_submitted/multichoice/statements.json

tests/mod_quiz/attempt_submitted/numerical/data.json

tests/mod_quiz/attempt_submitted/numerical/statements.json

tests/mod_quiz/attempt_submitted/randomsamatch/data.json