Make app store names bold in update owner dialog

As per latest mocks, app store names need to appear bold in update
ownership confirmation dialog.
Before: https://screenshot.googleplex.com/6EDQrp5HM46yk2P.png
After: https://screenshot.googleplex.com/7ucHAaipQZ3EToX.png

Bug: 279728191
Test: atest CtsPackageInstallTestCases:UpdateOwnershipEnforcementTest
Test: Manual, verify text matches mocks
Change-Id: Ib192ffb53a1346c694a664c6add3f5a9b330882e