npm rpc server: fix example #14803

Job	Run time
cargo deny	38s
Lint Rust	1m 40s
Check provider database	3s
Rust doc comments	19s
Build C library (ubuntu-latest)	2m 26s
Build C library (macos-latest)	2m 18s
Python lint	11s
Build deltachat-rpc-server (ubuntu-latest)	1m 52s
Rust tests (ubuntu-latest, 1.78.0)	2m 53s
Build deltachat-rpc-server (macos-latest)	2m 1s
Rust tests (windows-latest, 1.78.0)	7m 19s
Build deltachat-rpc-server (windows-latest)	6m 34s
Rust tests (macos-latest, 1.78.0)	2m 51s
Rust tests (ubuntu-latest, 1.77.0)	2m 45s
CFFI Python tests (ubuntu-latest, 3.12)	7m 19s
CFFI Python tests (macos-latest, 3.12)	5m 20s
CFFI Python tests (ubuntu-latest, pypy3.10)	6m 26s
CFFI Python tests (macos-latest, pypy3.10)	6m 36s
CFFI Python tests (ubuntu-latest, 3.7)	5m 42s
JSON-RPC Python tests (ubuntu-latest, 3.12)	3m 28s
JSON-RPC Python tests (macos-latest, 3.12)	3m 15s
JSON-RPC Python tests (windows-latest, 3.12)	3m 55s
JSON-RPC Python tests (ubuntu-latest, pypy3.10)	4m 41s
JSON-RPC Python tests (macos-latest, pypy3.10)	3m 39s
JSON-RPC Python tests (ubuntu-latest, 3.7)	3m 31s
	1h 27m 42s

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