fix: reduce number of repeat_vars() calls #17475

Job	Run time
Lint Rust	2m 33s
Build C library (ubuntu-latest)	8m 0s
cargo deny	31s
Build C library (macos-latest)	6m 35s
Rust doc comments	3m 39s
Check if node constants are up to date	13s
Check provider database	4s
Python lint	11s
Build deltachat-rpc-server (ubuntu-latest)	7m 25s
Rust tests (ubuntu-latest, 1.83.0)	3m 13s
Build deltachat-rpc-server (macos-latest)	7m 19s
Build deltachat-rpc-server (windows-latest)	19m 8s
Rust tests (windows-latest, 1.83.0)	7m 46s
Rust tests (macos-latest, 1.83.0)	4m 38s
Rust tests (ubuntu-latest, 1.77.0)	3m 19s
CFFI Python tests (ubuntu-latest, 3.13)	6m 55s
CFFI Python tests (macos-latest, 3.13)	5m 43s
CFFI Python tests (ubuntu-latest, pypy3.10)	6m 13s
CFFI Python tests (macos-latest, pypy3.10)	5m 45s
CFFI Python tests (ubuntu-latest, 3.7)	6m 42s
JSON-RPC Python tests (ubuntu-latest, 3.13)	1m 50s
JSON-RPC Python tests (macos-latest, 3.13)	1m 51s
JSON-RPC Python tests (windows-latest, 3.13)	2m 53s
JSON-RPC Python tests (ubuntu-latest, pypy3.10)	1m 53s
JSON-RPC Python tests (macos-latest, pypy3.10)	2m 1s
JSON-RPC Python tests (ubuntu-latest, 3.7)	1m 29s
	1h 57m 49s

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