[Toybox] [PATCH] ifconfig.test: deflake.

[enh]

::2 can legitimately be part of an IPv6 address, causing the test to
fail because the grep matches an unrelated part of the output. Be more
explicit about what we're actually searching for (as the previous test
already was) to avoid flakiness.
---
 tests/ifconfig.test | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
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