Respect forceNonSystemPackage param when creating new Setting objects.

Previously, new settings created via DeviceConfig.setProperty() resulted
in the forceNonSystemPackage param being ignored and the makeDefault
param being overwritten to true. This caused new Setting objects added
this way to always save their initial value as the default value. This
caused problems in tests that tried to make local changes and later
reset them to the prior state.

Test: atest FrameworksCoreTests:DeviceConfigTest
Bug: 147862338
Change-Id: I98a4585fc39cb8c39e630c0dcd318b05a085fcc3