Change how ms11_006_createsizeddibsection comes up with the outputpath

[wchen-r7]

The default outputpath for ms11_006_createsizeddibsection is invalid for systems such as OSX and Kali Linux, we should stop using that.

[See RM 8272]
http://dev.metasploit.com/redmine/issues/8272

[jvazquez-r7]

Looks good, and module is creating the file successfully after modification:

msf > use exploit/windows/fileformat/ms11_006_createsizeddibsection 
msf exploit(ms11_006_createsizeddibsection) > show options

Module options (exploit/windows/fileformat/ms11_006_createsizeddibsection):

   Name      Current Setting  Required  Description
   ----      ---------------  --------  -----------
   FILENAME  msf.doc          yes       The file name.


Exploit target:

   Id  Name
   --  ----
   0   Automatic


msf exploit(ms11_006_createsizeddibsection) > rexploit
[*] Reloading module...

[*] Creating 'msf.doc' file ...
[+] msf.doc created at /Users/juan/.msf4/local/msf.doc
msf exploit(ms11_006_createsizeddibsection) > 

File created:

$ file /Users/juan/.msf4/local/msf.doc
/Users/juan/.msf4/local/msf.doc: CDF V2 Document, Little Endian, Os: Windows, Version 1.0
$ ls -la /Users/juan/.msf4/local/msf.doc
-rw-r--r--  1 juan  staff  10240 Aug  5 13:16 /Users/juan/.msf4/local/msf.doc

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