[sts] add @SecurityTest for testing invalid font size scales

BUG: 175816890
Test: sts-tf > run sts-engbuild-no-spl-lock -m CtsProviderTestCases -t android.provider.cts.settings.Settings_SystemTest#testSystemSettingsRejectInvalidFontSizeScale
Change-Id: I7bdfbccf28f99084230068b388fea94e21892e55
(cherry picked from commit 493d5913313dfb6b64868de4c4720e5d0b82771f)
Merged-In: I7bdfbccf28f99084230068b388fea94e21892e55
1 file changed