Do not allow lossless encoding if delta_q is present
Do not allow lossless encoding if delta_q is present

Lossless doesn't make sense with delta_q.  However, one can argue that
with delta_q it may make sense to do lossless encoding temporarily,
but this doesn't seem to work in the encoder currently.

BUG=aomedia:1645

Change-Id: I075625298efe8d6b0f83efcab1233b6b4acc11de

GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom