fix(ivy): remove nested placeholders with i18n

[ocombe]

While testing that queries where unaffected by i18n translation that removed placeholders, I noticed that we actually forgot to remove nested placeholders because the logic to check for removed placeholders was wrong. We were using previousOrParentTNode to get the last created node, but it turns out that when you call elementEnd, previousOrParentTNode becomes the parent of the current node, and we would stop our check at the wrong index (index of the parent instead of the index of the last node).

[mhevery]

http://test/OCL:232940021:BASE:232940059:1549576847123:41edc61f

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