Fix DynamicLayout block index calculation after edit

DynamicLayout made wrong adjustments to the block indices set to be
redrawn. Every indice after the first change was being added the
diff count in the blocks. However this meant when there are 2 deletes
and an index as 1, it would become -1 (wrong array index). The change
should be applied to indices outside of [firstBlock, lastBlock].

Test: Added android.text.DynamicLayoutTest#testReflow_afterSpannableEdit
Test: bit FrameworksCoreTests:android.text.DynamicLayoutTest
Test: bit FrameworksCoreTests:android.text.DynamicLayoutBlocksTest
Test: bit CtsTextTestCases:android.text.cts.DynamicLayoutTest

Bug: 67405337
Change-Id: Ie5e5658ffca4293f32f7b574d22d307e9e8d52dc