Improve argument check readability of run_train.py (#1485)

Author: TillHae

src/weathergen/run_train.py

@@ -183,7 +183,7 @@ def train_with_args(argl: list[str], stream_dir: str | None):
 if __name__ == "__main__":
     # Entry point for slurm script.
     # Check whether --from_run_id passed as argument.
-    if next((True for arg in sys.argv if "--from_run_id" in arg), False):
+    if any("--from_run_id" in arg for arg in sys.argv):
         train_continue()
     else:
         train()