Fixed incorrect usage of native fences

This code was checking SyncFeatures::useWaitSync() and if that was true
was then using the EGL_ANDROID_native_fence_sync feature which is
incorrect. It can only use that feature if
SyncFeatures::useNativeFenceSync is true. Since it does also use
eglWaitSyncKHR, the check for useWaitSync() was left in as well.

Bug: 38452042, 77146928
Test: Verified screen capture test works on samus now

Change-Id: I5aad16c1b974b641c30faf2b1bc93ff8bedd5186
(cherry picked from commit 487abfa65449317d43877655750d7ead639d3ad6)