Normalize pinned clipboard IDs without trimming braces

Previously, curly braces were removed from GUIDs before converting to lowercase when normalizing pinned clipboard item IDs. Now, IDs are only converted to lowercase, preserving any curly braces. This may affect how IDs are matched and stored.

Author: Jack251970

src/Flow.Launcher.Plugin.ClipboardPlus.Core/Helpers/WindowsClipboardHelper.cs

@@ -144,10 +144,8 @@ private HashSet<string> GetPinnedClipboardItemIds()
                         {
                             foreach (var itemId in metadata.Items.Keys)
                             {
-                                // Remove curly braces from GUID format (e.g., "{GUID}" -> "GUID")
-                                // and convert to lowercase to match ClipboardHistoryItem.Id format
-                                var normalizedId = itemId.Trim('{', '}').ToLower();
-                                pinnedIds.Add(normalizedId);
+                                // Convert to lowercase to match ClipboardHistoryItem.Id format
+                                pinnedIds.Add(itemId.ToLower());
                             }
                         }
                     }