Update mailimap_types.h
Update mailimap_types.h

changed mailimap's member `complex_command_tag_enabled` to `is_163_workaround_enabled`.
jjz/libetpan,disaykin/libetpan,jjz/libetpan,disaykin/libetpan,disaykin/libetpan,jjz/libetpan