fix: revert git_branch patching

Co-authored-by: Han Qiao <qiao@supabase.io>

Author: gregnr

packages/mcp-server-supabase/src/server.ts

@@ -558,7 +558,6 @@ export function createSupabaseMcpServer(options: SupabaseMcpServerOptions) {
               },
               body: {
                 branch_name: 'main',
-                git_branch: 'main',
               },
             });