Fix indentation

Co-authored-by: Sébastien Doeraene <sjrdoeraene@gmail.com>

Author: mbovel

tests/warn/i17493.scala

@@ -1,5 +1,5 @@
 //> using options -explain
- class A(val s: String) extends AnyVal {
+class A(val s: String) extends AnyVal {
   // def f = eq("hello, world") // no warning for now because `eq` is inlined
   def g = synchronized { println("hello, world") } // warn
- }
+}