[SettingsProvider] fix server-side Readable maxTargetSdk check

I must have used the wrong autocomplete from Intellij. Previous tests were not able to catch this because we have the same check on the client side.

BUG: 172838801
BUG: 211711793
Test: atest android.appsecurity.cts.ReadableSettingsFieldsTest
Change-Id: Ia3e4541564d9928ff04fa95564bb9e043d49e8ee