Remove the 'new' word for accessibility gesture tutorial dialog

Root Cause: We merge back accessibility gesture feature into sc-v2, but
the tutorial dialog is still the original content.

Solution: Since it is not the new feature anymore, we just want to
introduce the feature, so remove the 'new' word.

Bug: 204850690
Test: manual test
Change-Id: I38aff0cee6779153066e414e654611fa83d0a533