Update InstallLocationUtils.calculateInstalledSize.

Before the change, the method called
DexMetadataHelper.getPackageDexMetadataSize, to get the DM size. It was
out-of-sync from ART, and prevents us from removing DexMetadataHelper, a
file for the legacy dexopt.

This CL uses a different way to calculate the size.

Bug: 258223472
Test: atest CtsPackageInstallTestCases
Flag: android.content.pm.alternative_for_dexopt_cleanup
Change-Id: I0cfa204c06110e0d2017737e4498782e47c46e3c