Fix path for app image in compile_bcp.sh script.

Test: compile_bcp.sh on device.
Change-Id: Ica8cbc7d94eb3de83cd06f8a4adbe17f7aa61e2c
diff --git a/tools/compile_bcp.sh b/tools/compile_bcp.sh
index 397456b..2fcee13 100755
--- a/tools/compile_bcp.sh
+++ b/tools/compile_bcp.sh
@@ -162,7 +162,7 @@
            --boot-image=/apex/com.android.art/javalib/boot.art:${output}/boot-framework.art \
            --dex-file=${jar} \
            --oat-file=${arch_output}/${stem}.odex \
-           --app-image-file=${oat_file_dir}/${stem}.art \
+           --app-image-file=${arch_output}/${stem}.art \
            --android-root=out/empty \
            --instruction-set=${systemserver_arch} \
            --abort-on-hard-verifier-error \