comctl32/listview: Always set the initial background mode to TRANSPARENT.
Comctl32 v5 listview sets the initial background mix mode to TRANSPARENT. Comctl32 v6 listview sets it to OPAQUE. Use TRANSPARENT for both v5 and v6 for now.
Comctl32 v5 listview sets the initial background mix mode to TRANSPARENT. Comctl32 v6 listview sets it to OPAQUE. Use TRANSPARENT for both v5 and v6 for now.