Disable invite and room sidepane expand icon

Their functions are not implemented yet.

TODO.md

@@ -6,6 +6,7 @@
     - Make all icon SVG files white/black, since we can now use ColorOverlay
     - Make the icon blue in EditAccount when hovering and no avatar set
     - Remove the filled theme
+    - Have a default background
 
   - Use [Animators](https://doc.qt.io/qt-5/qml-qtquick-animator.html)
     - Choose a better default easing type for animations

src/qml/Chat/RoomHeader.qml

@@ -103,6 +103,7 @@ HRectangle {
         anchors.right: parent.right
         opacity: collapseButtons ? 1 : 0
         visible: opacity > 0
+        enabled: false  // TODO
 
         backgroundColor: "transparent"
         icon.name: "reduced-room-buttons"

src/qml/Chat/RoomSidePane/MembersView.qml

@@ -57,6 +57,7 @@ HColumnLayout {
         }
 
         HButton {
+            enabled: false  // TODO
             icon.name: "room-send-invite"
             iconItem.dimension: parent.height - 10
             topPadding: 0