Fix CtsFsMgrTestCases failures

fs_mgr flags "slotselect" and "slotselect_other" are specific to A/B
devices, so remove these options from testcases because
CtsFsMgrTestCases could be ran on a non-A/B device.

Fixes: 187759127
Fixes: 187427233
Test: atest CtsFsMgrTestCases on sdk_phone64_x86_64-userdebug
Change-Id: I31c1429652629bb68e0ca504295c959ac7e013e2
1 file changed