[cubocore] fix fonts and theme

overlays/cubocore/etc/skel/.config/qt5ct/qt5ct.conf

 [Appearance]
 color_scheme_path=/usr/share/qt5ct/colors/airy.conf
 custom_palette=false
-icon_theme=Breath2
+icon_theme=breath2-dark
 standard_dialogs=default
 style=kvantum
 
 [Fonts]
-fixed=@Variant(\0\0\0@\0\0\0\x12\0\x43\0\x61\0n\0t\0\x61\0r\0\x65\0l\0l@$\0\0\0\0\0\0\xff\xff\xff\xff\x5\x1\0\x32\x10)
-general=@Variant(\0\0\0@\0\0\0\x12\0\x43\0\x61\0n\0t\0\x61\0r\0\x65\0l\0l@$\0\0\0\0\0\0\xff\xff\xff\xff\x5\x1\0\x32\x10)
+fixed=@Variant(\0\0\0@\0\0\0\x12\0M\0o\0n\0o\0s\0p\0\x61\0\x63\0\x65@(\0\0\0\0\0\0\xff\xff\xff\xff\x5\x1\0\x32\x10)
+general=@Variant(\0\0\0@\0\0\0\x12\0\x43\0\x61\0n\0t\0\x61\0r\0\x65\0l\0l@(\0\0\0\0\0\0\xff\xff\xff\xff\x5\x1\0\x32\x10)
 
 [Interface]
 activate_item_on_single_click=1
@@ -25,4 +25,4 @@ underline_shortcut=1
 wheel_scroll_lines=3
 
 [SettingsWindow]
-geometry=@ByteArray(\x1\xd9\xd0\xcb\0\x3\0\0\xff\xff\xff\xfd\xff\xff\xff\xf6\0\0\x2\xcf\0\0\x2\x80\0\0\0\0\0\0\0\x14\0\0\x2\xcc\0\0\x2}\0\0\0\0\0\0\0\0\a\x80\0\0\0\0\0\0\0\x14\0\0\x2\xcc\0\0\x2})
+geometry=@ByteArray(\x1\xd9\xd0\xcb\0\x3\0\0\0\0\0\0\0\0\0\x14\0\0\x2\xde\0\0\x2\x9a\0\0\0\0\0\0\0\x14\0\0\x2\xde\0\0\x2\x9a\0\0\0\0\0\0\0\0\x3 \0\0\0\0\0\0\0\x14\0\0\x2\xde\0\0\x2\x9a)