Fix the string encoding issues with logging the signature

The signature should be logged _before_ decoded from the Base64
encoding in order to properly compare with what is published on gstatic.

Bug: 391327942
Bug: 378626065
Flag: com.android.net.ct.flags.certificate_transparency_service
Test: atest NetworkSecurityUnitTests
Change-Id: Ibde2d4f45b998f764e2cb8d0772a0536ff763a4a
2 files changed