config.conf: fix order of i386 flavors
    
    Unlike on other architectures, i386/pae is the basic config and others,
    including i386/default are diffs against it. With i386/default listed
    first, it is also processed first by run_oldconfig.sh so that if there
    is a new config option, it is added to i386/default (as it's not present
    in i386/pae yet) even if the value is going to be the same as in
    i386/pae. To get stable result, one needs to run run_oldconfig.sh twice.
    
    Swat the two entries so that i386/pae is updated first and i386/default
    is created as a diff against already updated i386/pae.