ConfirmationUI AIDL VTS tests fix.

Replaced `sizeof` with `strlen` while converting char array to
`vector<uint8_t>`.

Bug: b/205760172
Test: run vts -m VtsHalConfirmationUIV1_0Target
Change-Id: I309f5fdb2088db1293a2278bc4a0518aa12b5601
1 file changed