Update setuid_viscosity

* Use cmd_exec

Author: jvazquez-r7

modules/exploits/osx/local/setuid_viscosity.rb

@@ -61,7 +61,7 @@ def check
       return CheckCode::Safe
     end
 
-    check = session.shell_command_token("find  #{datastore["Viscosity"]} -type f -user root -perm -4000")
+    check = cmd_exec("find  #{datastore["Viscosity"]} -type f -user root -perm -4000")
 
     if check =~ /ViscosityHelper/
       return CheckCode::Vulnerable