BinaryTransparencyServiceTest: Fix TEST_MAPPING

Tests to validate module name in test mapping file was failing due
to earlier usage of test name as module name. This change fixes
that by renaming the module name accordingly and putting test
class under `options` instead.

Bug: 233937408
Test: atest --no-bazel-mode BinaryTransparencyServiceTest
Change-Id: Idc12cbe38ec2025e5eb576afdbfa98b1e815c6fa