Fix all profile statuses appearing as pinned on PixelFed

Tusker/InstanceFeatures.swift

@@ -29,6 +29,10 @@ struct InstanceFeatures {
         instanceType == .pleroma
     }
     
+    var profilePinnedStatuses: Bool {
+        instanceType != .pixelfed
+    }
+    
     mutating func update(instance: Instance, nodeInfo: NodeInfo?) {
         let ver = instance.version.lowercased()
         if ver.contains("glitch") {
@@ -37,6 +41,8 @@ struct InstanceFeatures {
             instanceType = .hometown
         } else if ver.contains("pleroma") {
             instanceType = .pleroma
+        } else if ver.contains("pixelfed") {
+            instanceType = .pixelfed
         } else {
             instanceType = .mastodon
         }
@@ -51,6 +57,7 @@ extension InstanceFeatures {
         case pleroma
         case hometown
         case glitch
+        case pixelfed
         
         var isMastodon: Bool {
             switch self {

Tusker/Screens/Profile/ProfileStatusesViewController.swift

@@ -105,7 +105,8 @@ class ProfileStatusesViewController: DiffableTimelineLikeTableViewController<Pro
     }
     
     private func loadPinnedStatuses(snapshot: @escaping () -> Snapshot, completion: @escaping (LoadResult) -> Void) {
-        guard kind == .statuses else {
+        guard kind == .statuses,
+              mastodonController.instanceFeatures.profilePinnedStatuses else {
             completion(.success(snapshot()))
             return
         }

Tusker/Screens/Utilities/Previewing.swift

@@ -163,7 +163,8 @@ extension MenuPreviewProvider {
             }
             
             // only allowing pinning user's own statuses
-            if account.id == status.account.id {
+            if account.id == status.account.id,
+               mastodonController.instanceFeatures.profilePinnedStatuses {
                 let pinned = status.pinned ?? false
                 actionsSection.append(createAction(identifier: "pin", title: pinned ? "Unpin from Profile" : "Pin to Profile", systemImageName: pinned ? "pin.slash" : "pin", handler: { [weak self] (_) in
                     guard let self = self else { return }