logd: use ro.debuggable instead of ro.build.type

Change-Id: Ic644f1f78e68094f700834675f4acc63386a6b92
diff --git a/logcat/logpersist b/logcat/logpersist
index dab466d..8762ff1 100755
--- a/logcat/logpersist
+++ b/logcat/logpersist
@@ -1,8 +1,8 @@
 #! /system/bin/sh
 # logpersist cat start and stop handlers
 progname="${0##*/}"
-case `getprop ro.build.type` in
-userdebug|eng) ;;
+case `getprop ro.debuggable` in
+1) ;;
 *) echo "${progname} - Permission denied"
    exit 1
    ;;