Switch default phrase slop to 0

The unstemmed phrases ("foo bar") defaulted to 0 slop already.  This switches
stemmed phrases ("foo bar"~) to 0 slop by default.

Bug: 69226
Change-Id: I569fdb7f0d91b50fc291e0f0ce6967ad3a7195c6
Merge "Switch default phrase slop to 0"