Highlight first item when opening context menu

TODO.md

@@ -1,6 +1,5 @@
 # TODO
 
-- focus first item in menu if opened by kb
 - composer menu?
 - fix members not synced bug
 - fix local unread counters order

src/gui/Base/HMenu.qml

@@ -35,6 +35,7 @@ Menu {
     onOpened: {
         window.visibleMenus[uuid] = this
         window.visibleMenusChanged()
+        menu.currentIndex = 0
     }
     onClosed: {
         if (focusOnClosed) focusOnClosed.forceActiveFocus()