Fix android.text.cts.StaticLayoutTest#testGetEllipsisCount

The "moreChars" predicate (which is used in ellipsis computation) was
slightly incorrect, sometimes being computed as false when the line
break is at the end of a paragraph but not the end of the buffer.
This patch makes the behavior consistent with shipping versions.

Bug: 19676414
Change-Id: I72e16794e895c2eb765b21feaf59fcdccc4857f1