fixes DisplayUnlockCaptcha

[wandamaxm]

Fixes gpapi.googleplay.SecurityCheckError: 'Security check is needed, try to visit https://accounts.google.com/b/0/DisplayUnlockCaptcha to unlock, or setup an app-specific password'

There seemed to be a problem with the headers on the two requests to /auth. I have fixed these.
Also the dummy parameter (droidguard_results) mentioned in other pull requests, was necessary for me to get past the unlock captcha.

[kallix]

This did fix the issue for me.
@wandamaxm : Would you be able to comment on where to find this kind of info, for future use ?

[marty0678]

This, unfortunately, doesn't work for me, I get the same bad auth as mentioned in this issue - #162

(even with app passwords).

[Junus]

Hey @wandamaxm, I could login using your PR, but when I'm trying to download I couldn't get versionCode from details. I see limited details like numDownloads, package and etc. Do you know how I can solve it? Thanks