[HWUI] The IBO state should be reset after glDeleteBuffers.

Symptom:
Can't bind to correct IBO.

Root Cause:
If a buffer object that is currently bound is deleted by glDeleteBuffers, the binding reverts to 0.
This may cause bindIndicesBuffer doesn't work if mCurrentIndicesBuffer not reset to 0.

Solution:
Reset mCurrentIndicesBuffer to 0 after glDeleteBuffers.

Change-Id: Iecd3ded76d876fcadde89a8893bab5f75b1eb312