BF: get nthreads from basename, not full executable path

eddy/runEddy

@@ -76,7 +76,7 @@ do
     # into eddy_cpu --nthr=N
     fsl_sub="fsl_sub -l ${outdir} -q long.q"
     exe="${exe_name%_nthr*}"
-    nthr="${exe_name#eddy_cpu_nthr_}"
+    nthr="${variant#eddy_cpu_nthr_}"
     eddy_args+=("--nthr=${nthr}")
     if [ "${nthr}" != "1" ]; then
       fsl_sub="${fsl_sub} -s openmp,${nthr}"