Merge bitcoin/bitcoin#25511: test: non-positive integer value to -peertimeout should throw an error

d22bd54 test: passing a non-positive integer value to `-peertimeout` should throw an error (brunoerg)

Pull request description:

  This PR adds test coverage for #25506, since #25505 gets closed.

ACKs for top commit:
  kristapsk:
    ACK d22bd54
  w0xlt:
    ACK bitcoin/bitcoin@d22bd54
  1440000bytes:
    ACK bitcoin/bitcoin@d22bd54

Tree-SHA512: 89c8a097606cb52569d816cc2227baac832df70e381d07c4a12aeb024c500d334c8102218fc6519eebb3819159d8308119d7253d9192a6bebe13b8e738b286b9

Author: MacroFake

test/functional/p2p_timeouts.py

@@ -94,6 +94,11 @@ def run_test(self):
             no_version_node.wait_for_disconnect(timeout=1)
             no_send_node.wait_for_disconnect(timeout=1)
 
+        self.stop_nodes(0)
+        self.nodes[0].assert_start_raises_init_error(
+            expected_msg='Error: peertimeout must be a positive integer.',
+            extra_args=['-peertimeout=0'],
+        )
 
 if __name__ == '__main__':
     TimeoutsTest().main()