Fixed normal bug EXT-5244 ( There is no "i" button for Name fields from nearby chat)

- reason: changes in c91e724d4f15 related to EXT-4547.
    Also multiple warnings appeared in log: LLView::getChild: Found child named user_name but of wrong type class L
LTextBox, expecting class LLViewerTextEditor *

- fix: changed template class from LLViewerTextEditor to LLTextBase in getChild.

--HG--
branch : product-engine