message: add missing icon
diff: @@ -205,6 +205,7 @@ RES_ICONS = \
  qt/res/icons/hd_enabled.png \
  qt/res/icons/history.png \
  qt/res/icons/minting.png \
  + qt/res/icons/multisig.png \
  qt/res/icons/sign.png \
  qt/res/icons/lock_closed.png \
  qt/res/icons/lock_open.png \
  