fix --audit for --affix
fix --audit for --affix

Push audit strings into the right namespace.

Before:

$ echo "1 | aa" | ./vw -a  --quiet --affix 2
0
    :13622:1:0@0    aa:37289:1:0@0  Constant:116060:1:0@0

After:

$ echo "1 | aa" | ./vw -a  --quiet --affix 2
0
    affix^+2=aa:13622:1:0@0 aa:37289:1:0@0  Constant:116060:1:0@0

deaktator/vowpal_wabbit,deaktator/vowpal_wabbit,jon-morra-zefr/vowpal_wabbit,hal3/vowpal_wabbit,deaktator/vowpal_wabbit,jon-morra-zefr/vowpal_wabbit,deaktator/vowpal_wabbit,deaktator/vowpal_wabbit,deaktator/vowpal_wabbit,deaktator/vowpal_wabbit,hal3/vowpal_wabbit,jon-morra-zefr/vowpal_wabbit,hal3/vowpal_wabbit,jon-morra-zefr/vowpal_wabbit,jon-morra-zefr/vowpal_wabbit,jon-morra-zefr/vowpal_wabbit,deaktator/vowpal_wabbit,jon-morra-zefr/vowpal_wabbit,hal3/vowpal_wabbit,deaktator/vowpal_wabbit,jon-morra-zefr/vowpal_wabbit,hal3/vowpal_wabbit,hal3/vowpal_wabbit,hal3/vowpal_wabbit,deaktator/vowpal_wabbit,jon-morra-zefr/vowpal_wabbit,jon-morra-zefr/vowpal_wabbit,hal3/vowpal_wabbit,jon-morra-zefr/vowpal_wabbit,hal3/vowpal_wabbit,hal3/vowpal_wabbit,deaktator/vowpal_wabbit,hal3/vowpal_wabbit