Fix slide test.

Author: qwandor

tests/src/slides/slide-exemptions.list.ts

@@ -18,7 +18,6 @@ export const size_exemptions = [
 ];
 
 export const playground_size_exemptions = [
-  "bare-metal/aps/better-uart/driver.html",
   "bare-metal/microcontrollers/type-state.html",
   "concurrency/async-pitfalls/cancellation.html",
   "iterators/intoiterator.html",