Fix up changelog

Author: JoeRobich

CHANGELOG.md

@@ -15,7 +15,6 @@
 * Bumped xamlTools to 17.12.35403.211 (PR: [#7629](https://github.com/dotnet/vscode-csharp/pull/7629))
 
 # 2.51.x
-* Bumped xamltools to 17.12.35403.211 (PR: [#7629](https://github.com/dotnet/vscode-csharp/pull/7629))
 * Update Roslyn to 4.13.0-1.24503.11 (PR: [#7618](https://github.com/dotnet/vscode-csharp/pull/7618))
   * LSP hover responses escape backticks within inline code (PR: [#75364](https://github.com/dotnet/roslyn/pull/75364))
   * Localize build host message output (PR: [#74910](https://github.com/dotnet/roslyn/pull/74910))