Use "false" instead of "/system/bin/false".

The android root might be different than /system

test: test-art-target with ANDROID_ROOT=/data/local/tmp/system
Change-Id: I7b0a6b5444442661daaf5c53032d93263d388f99
diff --git a/test/etc/run-test-jar b/test/etc/run-test-jar
index 7d218f1..f3d4332 100755
--- a/test/etc/run-test-jar
+++ b/test/etc/run-test-jar
@@ -19,7 +19,7 @@
 DEV_MODE="n"
 DEX2OAT=""
 EXPERIMENTAL=""
-FALSE_BIN="/system/bin/false"
+FALSE_BIN="false"
 FLAGS=""
 ANDROID_FLAGS=""
 GDB=""