angler: init.angler.diag.rc.user: not remove /dev/diag in factory mode

when the boot mode is normal, remove /dev/diag.
when the boot mode is factory, do not remove /dev/diag.
diag_test_server uses this node in factory mode.

BUG: 23364863

Change-Id: Iaf5a90f33c781125a5d830a0422baa1e2f6e2c63
Signed-off-by: Wei Li <sirius.liwei@huawei.com>
diff --git a/init.angler.diag.rc.user b/init.angler.diag.rc.user
old mode 100644
new mode 100755
index 406f42c..164d3aa
--- a/init.angler.diag.rc.user
+++ b/init.angler.diag.rc.user
@@ -1,4 +1,4 @@
 # This file gets copied as /init.angler.diag.rc
 
-on boot
+on property:ro.boot.mode=normal
     rm /dev/diag