libsnapshot: Reinitiaze SnapshotMergeStats instance

If SnapshotManager instance merge path has changed,
then reinitialize the SnapshotMergeStats instance.

Bug: 401952955
Test: OTA on Pixel
Change-Id: I1a6b2de0274afa223f081787726cc87e787e5f30
Signed-off-by: Akilesh Kailash <akailash@google.com>
2 files changed