More cleanup

aoc/src/dev/ctsk/aoc/days/Day08.scala

@@ -22,13 +22,13 @@ object Day08 extends Solver(8):
             .flatMap((a, b) => Iterator(a + a - b, b + b - a))
             .filter(grid.contains)
         )
-        .toSet
+        .distinct
         .size
 
     def part2: Int =
       antennae
         .flatMap(_.pairs.flatMap(p => antinodes(p._1, p._2)))
-        .toSet
+        .distinct
         .size
   def run(input: os.ReadablePath): (Timings, Solution) =
     val (pre_time, ctx) = timed { Ctx(input) }