CustomToolButton: Improve highlighted color

Author: adazem009

src/uicomponents/CustomToolButton.qml

@@ -14,6 +14,7 @@ CustomButton {
  signal clicked()
  id: control
  font.capitalization: Font.MixedCase
+ Material.background: ThemeEngine.theme == ThemeEngine.DarkTheme ? (highlighted ? Qt.darker(ThemeEngine.accentColor, 2) : Qt.rgba(0.25, 0.24, 0.25, 1)) : (highlighted ? Qt.lighter(ThemeEngine.accentColor, 2) : Qt.rgba(0.84, 0.84, 0.84, 1))
  Material.foreground: foregroundColor
  icon.color: foregroundColor
  onReleased: clicked()