Fix ManifestMerger issues

Set LOCAL_MIN_SDK_VERSION in setup-wizard-lib so that the build system
doesn't raise the minSdkVersion value specified in the manifest, which
causes ManifestMerger to error when trying to merge it into a package
that specifies a lower minSdkVersion.

Bug: 78447299
Test: m java
Change-Id: Ia72327d787c45f6e2f35df97094b92cf6e88e214