Fix another test

Author: odersky

tests/patmat/planets.scala

@@ -1,9 +1,8 @@
-enum class Planet(mass: Double, radius: Double) {
+enum Planet(mass: Double, radius: Double) {
   private final val G = 6.67300E-11
   def surfaceGravity = G * mass / (radius * radius)
   def surfaceWeight(otherMass: Double) =  otherMass * surfaceGravity
-}
-object Planet {
+
   case MERCURY extends Planet(3.303e+23, 2.4397e6)
   case VENUS   extends Planet(4.869e+24, 6.0518e6)
   case EARTH   extends Planet(5.976e+24, 6.37814e6)