Dark Theme: Make unfocussed minitargetchoser item easier to spot

The least invasive way to do that was to chose a brighter background
color.

Task-number: QTCREATORBUG-16702
Change-Id: I4d3d129ddc197e9747079484d9faf104e1b8c3bc
Reviewed-by: Orgad Shaneh <orgads@gmail.com>

share/qtcreator/themes/dark.creatortheme

@@ -97,7 +97,7 @@ MenuBarItemTextColorDisabled=textDisabled
 MenuBarItemTextColorNormal=text
 MenuItemTextColorDisabled=textDisabled
 MenuItemTextColorNormal=text
-MiniProjectTargetSelectorBackgroundColor=shadowBackground
+MiniProjectTargetSelectorBackgroundColor=normalBackground
 MiniProjectTargetSelectorBorderColor=shadowBackground
 MiniProjectTargetSelectorSummaryBackgroundColor=shadowBackground
 MiniProjectTargetSelectorTextColor=text