Revert "setType to Block(...)"

This reverts commit b62ddaa4e9.

core-macros/src/main/scala/sbt/internal/util/appmacro/ContextUtil.scala

@@ -321,8 +321,7 @@ final class ContextUtil[C <: blackbox.Context](val ctx: C) {
                 case _                                                      => Some(stat)
               }
             }
-            val expr = super.transform(expr0)
-            Block(stats, expr).setType(expr.tpe)
+            Block(stats, super.transform(expr0))
           case _ => super.transform(tree)
         }
     }