The yank register "0 is only used when using y{motion} commands.
This fixes the following:

In normal mode:
input:  |aaa bbb ccc
keys:   yiw w diw "0P
result: aaa aaa ccc

Change-Id: I7fb8a62aed29b753ff8b129b5a8aa5f8e965026e
Reviewed-by: hjk <hjk@theqtcompany.com>