message: Add missing image to res
diff: @@ -554,6 +554,7 @@ qt/res/styles/theme1/scrollbardark.css \
  qt/res/styles/theme1/buttongray.css \
  qt/res/styles/theme1/tableviewlight.css \
  qt/res/styles/theme1/config.ini \
  +qt/res/styles/theme1/app-icons/down_arrow_unit.png \
  qt/res/styles/theme1/app-icons/toolbutton_right_arrow.png \
  qt/res/styles/theme1/app-icons/spinBoxHover.png \
  qt/res/styles/theme1/app-icons/down_arrow.png \
  