Fix wrong offset of BiDi text by TextShaper

This CL includes:
- Fix relative offset of BidiRun by reviving width calculation in TextLine.
- Fix bidi level buffer offset. It shuold be relative to the substring, but
  the absolute offset was passed.
- Removed paint argument from PositionedGlyph which is not used.

Bug: 171275519
Test: atest android.graphics.text.cts.TextRunShaperTest
Test: atest android.text.cts.TextShaperTest

Change-Id: I36949089d744bdfae61995210b2051866a7510ac