Change package name for merging to SettingsLibWidget

To have the modules merged to SettingsLibWidget, we changed the package
name in the Manifest to com.android.settingslib.widget

Test: WallpapaerPickerGoogle can successfully built after the merge of
modules
Bug: 240421545

Change-Id: If9eb4cefaa22c71eb8dad32618e84e1102c599df
7 files changed