fix: make ExtraChat filtering actually work

ChatTwo/Ui/SettingsTabs/Tabs.cs

@@ -165,6 +165,10 @@ internal sealed class Tabs : ISettingsTab {
 
                     ImGui.Separator();
 
+                    if (tab.ExtraChatAll) {
+                        ImGui.BeginDisabled();
+                    }
+
                     foreach (var (id, name) in this.Plugin.ExtraChat.ChannelNames) {
                         var enabled = tab.ExtraChatChannels.Contains(id);
                         if (!ImGui.Checkbox($"{name}##ec-{id}", ref enabled)) {
@@ -178,6 +182,10 @@ internal sealed class Tabs : ISettingsTab {
                         }
                     }
 
+                    if (tab.ExtraChatAll) {
+                        ImGui.EndDisabled();
+                    }
+
                     ImGui.TreePop();
                 }