add automatic <br> back to field references
add automatic <br> back to field references

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will now automatically add a <br> to the first field reference, like previous
Anki versions did. The <br> is too complicated for users who just want a plain
template without any HTML.

Stvad/anki,florianjacob/anki,go38/anki,weihautin/anki,holycrepe/anki,xuewenfei/anki,subfusc/anki,kenjhim/anki,hssm/anki,eduOS/anki,socialpercon/anki-1,Arthaey/anki,abeyer/anki,weihautin/anki,jkitching/anki,ospalh/libanki3,hssm/anki,jakesyl/ruby-card,sunclx/anki,jakesyl/ruby-card,LucasCabello/anki