Force default format of settings in windows to ini format.

Faleh Alotaibirequested to merge
f-alotaibi/gui:f-alotaibi-master-patch-21a8 into master

Fixes #69 (closed). when qtemu is ran on windows (tested on windows 10) it seems that it tries to find the settings as a file, instead of looking in the registry, resulting for the spam you see in #69 (closed). This MR forces ini format for QSettings for windows systems. fixing that issue.

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