init sets the default PATH itself, better.

This fixes 'su' and 'strace' in the recovery image.

Change-Id: I83c2664d32a15da92bb6092fbdfc772184013c88
diff --git a/etc/init.rc b/etc/init.rc
index 6c07c60..0a4c6e9 100644
--- a/etc/init.rc
+++ b/etc/init.rc
@@ -5,7 +5,6 @@
     start healthd
 
 on init
-    export PATH /sbin:/system/bin
     export ANDROID_ROOT /system
     export ANDROID_DATA /data
     export EXTERNAL_STORAGE /sdcard