Revert "Enable one_sided_compound by default"

This reverts commit bf3813a166111c830ed938619c9b0553b9bef90e.

Reason for revert: feature not ready.
Incompatible with lossless under some circumstances,
causes the following assertion failure:
Assertion `(!is_compound) == (cm->reference_mode == SINGLE_REFERENCE)' failed

BUG=aomedia:575

Change-Id: I63a2b38ce3b7cb50108ac559cca0768b4579c9ae
1 file changed