chore: fix bug in tryIntros
#111
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tryIntrosfails on∀-statements with more than one variable. This causesext i jto fail if anext-lemma of the form∀ i j, M i j = N i j → M = Nis applied. The result is that onlyiis introduced and the goal starts with∀j, _. An example is added to the test cases.See Zulip.