hide invite avatars when such flag is on

This affects:
- Invited room preview inviter avatar
- Invited room preview room avatar
- Invited room cell inviter avatar in the room list
- Invited room cell room avatar in the room list
- Push notification for an invite

ElementX/Sources/Screens/Settings/DeveloperOptionsScreen/DeveloperOptionsScreenModels.swift

@@ -40,7 +40,6 @@ protocol DeveloperOptionsProtocol: AnyObject {
     var publicSearchEnabled: Bool { get set }
     var hideUnreadMessagesBadge: Bool { get set }
     var fuzzyRoomListSearchEnabled: Bool { get set }
-    var hideTimelineMedia: Bool { get set }
     var enableOnlySignedDeviceIsolationMode: Bool { get set }
     var elementCallBaseURLOverride: URL? { get set }
     var knockingEnabled: Bool { get set }

ElementX/Sources/Screens/Settings/DeveloperOptionsScreen/View/DeveloperOptionsScreen.swift

@@ -46,12 +46,6 @@ struct DeveloperOptionsScreen: View {
                 }
             }
             
-            Section("Room") {
-                Toggle(isOn: $context.hideTimelineMedia) {
-                    Text("Hide image & video previews")
-                }
-            }
-            
             Section("Join rules") {
                 Toggle(isOn: $context.knockingEnabled) {
                     Text("Knocking")