Fixed a bug in the allennlp tutorial

[donggrant]

What does this PR do?

Fixes a small bug in tutorial 7 where the user is asked to try textattack on an AllenNLP model.

Summary

This PR changes a line of code in the call function. Originally, "self.model.predict(sentence=text_input)" throws an error that notifies the user that "BasicClassifier" does not have attribute "predict". Under further examination, self.predictor actually contains the "predict" attribute, not self.model, which was assigned self.predictor._model.

Additions

Changes

• "self.model.predict()" in call function of class AllenNLPModel was changed to "self.predictor.predict()"

Deletions

Checklist

• [ ] The title of your pull request should be a summary of its contribution.
• [ ] Please write detailed description of what parts have been newly added and what parts have been modified. Please also explain why certain changes were made.
• [ ] If your pull request addresses an issue, please mention the issue number in the pull request description to make sure they are linked (and people consulting the issue know you are working on it)
• [ ] To indicate a work in progress please mark it as a draft on Github.
• [ ] Make sure existing tests pass.
• [ ] Add relevant tests. No quality testing = no merge.
• [ ] All public methods must have informative docstrings that work nicely with sphinx. For new modules/files, please add/modify the appropriate .rst file in TextAttack/docs/apidoc.'

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[jxmorris12]

Thanks @donggrant! (The diff should be one line, but notebook diffs are annoying like that.)