Fix warning

app/src/main/java/net/pokeranalytics/android/calculus/Stat.kt

@@ -37,9 +37,9 @@ enum class Stat : RowRepresentable {
      * Returns whether the stat evolution values requires a distribution sorting
      */
     fun hasDistributionSorting() : Boolean {
-        when (this) {
+        return when (this) {
-            STANDARD_DEVIATION, STANDARD_DEVIATION_HOURLY, STANDARD_DEVIATION_BB_PER_100_HANDS -> return true
+            STANDARD_DEVIATION, STANDARD_DEVIATION_HOURLY, STANDARD_DEVIATION_BB_PER_100_HANDS -> true
-            else -> return false
+            else -> false
         }
     }