[Toybox] [PATCH] ifconfig.test: don't check for specific error message.

[enh]

A 5.4 kernel returns EINVAL rather than ENOBUFS when you try to
configure an IPv6 address with the MTU set too small to support IPv6.

Rather than check for both errors, just check for generic failure for
now.
---
 tests/ifconfig.test | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)
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