Bug#850501: rerunning using diffoscope 67-21-gfe7ae15

[Hans-Christoph Steiner]

Thanks for your work on the APK diffing!  I had to fix a typo to get it
running that was introduced in diffoscope commit
fe7ae15e1c177866acd478af4cc4a51bd5002017 at the bottom of it. It turned
'f_out' into a non-existent 'w'.

With that change, diffoscope is now working for me again.  I'm running
it on the fdroid verification server, you can see the output here:

https://verification.f-droid.org/


Also, about apktool.yml, I don't think we need it at all in diffoscope.
It is not a file from the APK and it is not produced by Android SDK
tools. As far as I know, it is only used by apktool if you want to use
apktool to reconstruct a previously "decoded" APK.