Remove FuseTargetPreparer

Now that FUSE is on by default on the build, we don't need to ensure
FUSE flag is on before running FUSE tests.

There also seemed to be some test failures/flakiness resulting from
reading a potentially wrong value from
persist.sys.fflag.override.settings_fuse

Test: m
Bug: 149512775
Change-Id: I1ff6a0babf6aa6409c077d7a3e728c94ba11ca52
2 files changed