update.sh: specify configuration file to dxr-index.py
update.sh: specify configuration file to dxr-index.py

This is so both are guaranteed to fetch the settings from the
same place.

jonasfj/dxr,jonasfj/dxr,bozzmob/dxr,pelmers/dxr,pelmers/dxr,jonasfj/dxr,pombredanne/dxr,srenatus/dxr,srenatus/dxr,jonasfj/dxr,pelmers/dxr,KiemVM/Mozilla--dxr,erikrose/dxr,pombredanne/dxr,jay-z007/dxr,bozzmob/dxr,gartung/dxr,jbradberry/dxr,jay-z007/dxr,erikrose/dxr,jay-z007/dxr,kleintom/dxr,KiemVM/Mozilla--dxr,nrc/dxr,jbradberry/dxr,jay-z007/dxr,srenatus/dxr,pombredanne/dxr,pombredanne/dxr,jbradberry/dxr,bozzmob/dxr,jay-z007/dxr,bozzmob/dxr,bozzmob/dxr,erikrose/dxr,KiemVM/Mozilla--dxr,kleintom/dxr,jbradberry/dxr,gartung/dxr,srenatus/dxr,erikrose/dxr,kleintom/dxr,srenatus/dxr,pombredanne/dxr,pombredanne/dxr,bozzmob/dxr,jay-z007/dxr,nrc/dxr,bozzmob/dxr,erikrose/dxr,gartung/dxr,kleintom/dxr,pelmers/dxr,KiemVM/Mozilla--dxr,jbradberry/dxr,pelmers/dxr,pelmers/dxr,nrc/dxr,jbradberry/dxr,nrc/dxr,kleintom/dxr,pelmers/dxr,jonasfj/dxr,jbradberry/dxr,nrc/dxr,KiemVM/Mozilla--dxr,gartung/dxr,srenatus/dxr,KiemVM/Mozilla--dxr,nrc/dxr,jonasfj/dxr,jay-z007/dxr,gartung/dxr,kleintom/dxr,pombredanne/dxr,kleintom/dxr,gartung/dxr,gartung/dxr