std.http.Client: don't send TLS close_notify

It appears to be implemented incorrectly in the wild and causes the read
connection to be closed even though that is a direct violation of RFC
8446 Section 6.1.

The writeEnd function variants are still there, ready to be used.

lib/std/http/Client.zig

@@ -47,7 +47,7 @@ pub const Request = struct {
                 try req.stream.writeAll(req.headers.items);
             },
             .https => {
-                try req.tls_client.writeAllEnd(req.stream, req.headers.items, true);
+                try req.tls_client.writeAll(req.stream, req.headers.items);
             },
         }
     }