Updated some formatting as requested along with some rubocob requested

modules/exploits/linux/local/apt_package_manager_persistence.rb

@@ -89,7 +89,7 @@ class MetasploitModule < Msf::Exploit::Local
     print_status('Backdoor will run on next Apt update')
 
     # permissions chosen to reflect common perms in /usr/local/bin/
-    chmod(backdoor_path, 0755) 
-  
+    chmod(backdoor_path, 0755)
+
   end
-end
+end