Fix a whitespace issue, restore option naming

Author: smcintyre-r7

documentation/modules/exploit/multi/http/phpmailer_arg_injection.md

@@ -20,7 +20,7 @@ exploitation can take a few minutes.
 
 ## Options
 
-### WaitTimeout
+### WAIT_TIMEOUT
 Seconds to wait to trigger the payload
 ### NameField
 Name of the element for the Name field

modules/exploits/multi/http/phpmailer_arg_injection.rb

@@ -60,7 +60,7 @@ def initialize(info = {})
       ])
     register_advanced_options(
       [
-        OptInt.new('WaitTimeout', [true, 'Seconds to wait to trigger the payload', 300]),      
+        OptInt.new('WAIT_TIMEOUT', [true, 'Seconds to wait to trigger the payload', 300]),
         OptString.new('NameField', [true, 'Name of the element for the Name field', 'name'], regex: /^([^\t\n\f \/>"'=]+)$/),
         OptString.new('EmailField', [true, 'Name of the element for the Email field', 'email'], regex: /^([^\t\n\f \/>"'=]+)$/),
         OptString.new('MessageField', [true, 'Name of the element for the Message field', 'message'], regex: /^([^\t\n\f \/>"'=]+)$/)
@@ -72,7 +72,7 @@ def trigger(trigger_uri)
 
     page_found = false
     sleep_time = 10
-    wait_time = datastore['WaitTimeout']
+    wait_time = datastore['WAIT_TIMEOUT']
     print_status("Waiting for up to #{wait_time} seconds to trigger the payload")
     while wait_time > 0
       sleep(sleep_time)