contrib: Fix passing ipFamily to kind.sh
contrib: Fix passing ipFamily to kind.sh

Previously, the script was bailing out with the error when the ipFamily
was specified.

Some changes were suggested by Alexandre Perrin <alex@kaworu.ch>.

Fixes: 74ef715769 ("contrib: Make KIND cluster ipFamily configurable")
Signed-off-by: Martynas Pumputis <6b0d31c0d563223024da45691584643ac78c96e8@lambda.lt>

michi-covalent/cilium,michi-covalent/cilium,cilium/cilium,michi-covalent/cilium,michi-covalent/cilium,cilium/cilium,cilium/cilium,michi-covalent/cilium,cilium/cilium,cilium/cilium