test/l4lb: fix fractional seconds format in `curl -m` command
test/l4lb: fix fractional seconds format in `curl -m` command

Fractional time needs to specified in the correct format according to
the locale. Set LC_NUMERIC=C explicitly and use "." instead of ",". See
https://everything.curl.dev/usingcurl/timeouts#maximum-time-allowed-to-spend

Fixes: 9e8a692f8ae6 ("feat: add XDP L4LB e2e test for backend-weights")

Signed-off-by: Tobias Klauser <059b8b880f8441509ec8a65b50b4c6ae74ebea76@cilium.io>

cilium/cilium,cilium/cilium,cilium/cilium,cilium/cilium,cilium/cilium