Add forget to room context menu

Also show Leave only if not already left, and rename forget-room.svg to
room-forget.svg

src/qml/Base/HMenuItem.qml

@@ -6,8 +6,8 @@ MenuItem {
     spacing: theme.spacing
     leftPadding: spacing
     rightPadding: spacing
-    topPadding: spacing / 1.5
-    bottomPadding: spacing / 1.5
+    topPadding: spacing / 1.75
+    bottomPadding: spacing / 1.75
 
 
     readonly property alias iconItem: contentItem.icon

src/qml/Chat/Banners/LeftBanner.qml

@@ -14,7 +14,7 @@ Banner {
         {
             name: "forget",
             text: qsTr("Forget"),
-            iconName: "forget-room",
+            iconName: "room-forget",
         }
     ]
 

src/qml/SidePane/DelegateRoom.qml

@@ -78,11 +78,20 @@ HTileDelegate {
 
     contextMenu: HMenu {
         HMenuItem {
+            visible: ! model.data.left
             icon.name: invited ? "invite-decline" : "room-leave"
             text: invited ? qsTr("Decline invite") : qsTr("Leave")
             onTriggered: py.callClientCoro(
                 model.user_id, "room_leave", [model.data.room_id]
             )
         }
+
+        HMenuItem {
+            icon.name: "room-forget"
+            text: qsTr("Forget")
+            onTriggered: py.callClientCoro(
+                model.user_id, "room_forget", [model.data.room_id]
+            )
+        }
     }
 }