Fix build time warning

Fixes warning:
system/sepolicy/public/install_recovery.te:14:WARNING 'unrecognized character' at token ''' on line 13335:
allow install_recovery vendor_file:file { { getattr open read ioctl lock } { getattr execute execute_no_trans } };'

Bug: 37105075
Test: Fugu policy builds without this warning.
Change-Id: I8f417c51a816f3983a918c7e36dd804c5b85543f

public/install_recovery.te

@@ -10,7 +10,7 @@ allow install_recovery shell_exec:file rx_file_perms;
 
 # Execute /system/bin/applypatch
 allow install_recovery system_file:file rx_file_perms;
-not_full_treble(allow install_recovery vendor_file:file rx_file_perms;')
+not_full_treble(`allow install_recovery vendor_file:file rx_file_perms;')
 
 allow install_recovery toolbox_exec:file rx_file_perms;