Correct name of sage artifact

tex/Makefile

-SAGETEXARTIFACT=main.sagetex.sout
-SAGETEXSCRIPT=main.sagetex.sage # generated by latex compile
+SAGETEXARTIFACT=max-destabilizer-rank.sagetex.sout
+SAGETEXSCRIPT=max-destabilizer-rank.sagetex.sage # generated by latex compile
 
 aux_files/${SAGETEXARTIFACT}: aux_files/${SAGETEXSCRIPT} notebook_py_libs
 	cd aux_files && PYTHONPATH=../../generated_py_libs sage ${SAGETEXSCRIPT}