Linting retro rewind code

[DirkDoes]

change the RetroRewind installation a bit

How to Test:

Install RR and test if it installs it all correctly/

What Has Been Changed:

1. Removed the double path concatination (just picked the first one and went with that)
2. Removed the fallback sourceFolder path!!
   Initially it would search for folder RetroRewind6, and if extraction folder was there, but not RetroRewind6 then it would just pick the first one in that list O_O. It should not do that and just throw. the zip must always contain this folder, if it doesn't, then the downloaded zip might be corrupted, or who knows... . In any case, there are also more folders, and the zip also contains the folder named apps which means that the first folder is not even RetroRewind6. And even if it was, ZPL could have added this apps folder later without us knowing and then it would also break. So yea, removed that bit.
3. Added logging for this installation. Just 1 log for now in this downloadExtract method. might add it in the rest of the file later.

Related Issue Link: #181