Disable tracing again

Author: Blaisorblade

compiler/src/dotty/tools/dotc/config/Config.scala

@@ -160,7 +160,7 @@ object Config {
   final val showCompletions = false
 
   /** If set, enables tracing */
-  final val tracingEnabled = true
+  final val tracingEnabled = false
 
   /** Initial capacity of uniques HashMap.
    *  Note: This MUST BE a power of two to work with util.HashSet