Fix precedence in writePrefixExpression.

Just noticed a subtle error in this code while re-reviewing it.
Since we are converting the prefix-expression to a multiplicative-
expression, the precedence needed to be updated as well.

Change-Id: If750fc605e41c18ca4982f04f5b8c905cd663faa
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/705077
Commit-Queue: Brian Osman <brianosman@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
1 file changed