Remove some flags from the parameterization of PreferencesHelperTest

Several of these have already been in Nextfood for a while, and the exponential combination was causing the test to exceed its allotted time.

Bug: 393054998
Test: atest PreferencesHelperTest
Flag: TEST_ONLY
Change-Id: Ia51c98f1c143daca0b057b7ddb75232e002ce17f