really use the filename given on command line

tenbaht · tenbaht · commit 954bcbeef8bb · 2017-11-07T16:47:42.000+01:00
diff --git a/board-manager/assemble.sh b/board-manager/assemble.sh
@@ -35,4 +35,4 @@ done;
 sed -ie '/},/{
 	N;
 	s/},\s*{}/}/
-}' package_sduino_stm8_index.json
+}' ${PACKAGEFILE}
