Fix a couple high contrast CTS tests

Emoji fonts are allowed to vary by default. We could
try to find the NotoEmoji font specifically, but it's
easier to just not have an emoji in this test

Bug: 413638170
Test: this
Flag: EXEMPT test fix
Change-Id: I0d34fc5f5239d998ee815a82f6a6c105b66a833d
3 files changed