Don't squash words with a<br>tag between them

Some of our text has <br> tags to separate paragraphs without.  Sometimes
words are only separated by these tags.  So we jam a \n into the search
index in front of the tag just in case.

Bug: 73558
Change-Id: Ia98e409fcbcfb2e416912e1f32c1ec50f23b3061