Fix SEG_LVL_MAX
Fix SEG_LVL_MAX

Unwanted modification has been introduced in a752d1d5051142ff

When CONFIG_SEGMENT_ZEROMV is set to 0, SEG_LVL_MAX shall not change.

Change-Id: Idf547b3e9e1dffb4054b6a7c4251fc0290f95ad0

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