A small update that allows text to be pasted manually into the textbo…

[maquarius]

…x and fixes the error that happend when pasting manually.

If the manual pasting is prevented intentionally then e.preventDefault(); needs to be reverted.
navigator.clipboard.getText() doesn't work nontheless

[google-cla]

We found a Contributor License Agreement for you (the sender of this pull request), but were unable to find agreements for all the commit author(s) or Co-authors. If you authored these, maybe you used a different email address in the git commits than was used to sign the CLA (login here to double check)? If these were authored by someone else, then they will need to sign a CLA as well, and confirm that they're okay with these being contributed to Google.
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[maquarius]

@googlebot I fixed it.

[maquarius]

@developit Tagging you since you worked on the project.

[developit]

LGTM!