Remove explicit switch annotation in test

Author: harpocrates

compiler/test/dotty/tools/backend/jvm/DottyBytecodeTests.scala

@@ -123,7 +123,7 @@ class TestBCode extends DottyBytecodeTest {
       """
         |object Foo {
         |  import scala.annotation.switch
-        |  def foo(s: String) = (s: @switch) match {
+        |  def foo(s: String) = s match {
         |    case "AaAa" => println(3)
         |    case "BBBB" | "c" => println(2)
         |    case "D" | "E" => println(1)