Reset fenceFd without calling close on it

Locking the fd takes ownership of it (https://cs.android.com/android/platform/superproject/+/master:frameworks/native/libs/ui/include/ui/Gralloc.h;l=68;drc=916c2d0bd4a6dae3eececb8d0e74f0ff00959816), but Image_setFenceFd closes the fd as well, so it was getting double closed

Bug: 243257933
Change-Id: I04c1dd86c1ff7f99f8954873381a0e5a002b7360