Delete `values-w210dp-round-watch/styles.xml`.

This removes a specific toast text appearance override for round watches
with a width of 210dp or more.

Bug: 445057291
Flag: EXEMPT BUGFIX
Test: screenshot/4Zn357mVFBa6dvU
Cherrypick-From: https://googleplex-android-review.googlesource.com/q/commit:77e8fc2936a4d391b92433f725c70cf35dc2e49b
Merged-In: I519d3435d70d296cedc696ebb173fbe111967385
Change-Id: I519d3435d70d296cedc696ebb173fbe111967385