Fix event list + composer double context menu

Don't also Aopen the composer's context menu when there are
highlighted or selected messages in the timeline and user presses the
menu key.

src/gui/Pages/Chat/Composer/MessageArea.qml

@@ -95,6 +95,8 @@ HTextArea {
     disabledText: qsTr("You do not have permission to post in this room")
     placeholderText: qsTr("Type a message...")
     enableCustomImagePaste: true
+    menuKeySpawnsMenu:
+        ! (eventList && (eventList.currentItem || eventList.selectedCount))
 
     backgroundColor: "transparent"
     focusedBorderColor: "transparent"