Revert "Qt: set breeze as default theme"

This reverts commit 31d935254b.

Now that we are adding kali purple themes I've noticed that breeze qt
theme doens't follow the color-palette everywhere. In some cases it
still shows the blue highlight color.
Plus installing it in Xfce as an example takes 40MiB (unpacked)

etc/xdg/qt5ct/qt5ct.conf

@@ -4,10 +4,10 @@ icon_theme=Flat-Remix-Blue-Dark
 color_scheme_path=/usr/share/qt5ct/colors/Kali-Dark.conf
 standard_dialogs=default
 standard_dialogs=gtk3
-style=Breeze
+style=Fusion
 
 [Interface]
-#stylesheets=/usr/share/qt5ct/qss/fusion-simple-scrollbar.qss
+stylesheets=/usr/share/qt5ct/qss/fusion-simple-scrollbar.qss
 
 [Fonts]
 fixed=@Variant(\0\0\0@\0\0\0\x12\0\x46\0i\0r\0\x61\0 \0\x43\0o\0\x64\0\x65@$\0\0\0\0\0\0\xff\xff\xff\xff\x5\x1\0\x39\x10)