Revert "Use a This parameter instead of this.type in Tuple.toList"

This partially reverts commit 528bb7e.

Author: mbovel

library/src/scala/Tuple.scala

@@ -13,9 +13,9 @@ sealed trait Tuple extends Product {
     runtime.Tuples.toArray(this)
 
   /** Create a copy of this tuple as a List */
-  inline def toList[This >: this.type <: Tuple]: List[Union[This]] =
+  inline def toList: List[Union[this.type]] =
     this.productIterator.toList
-      .asInstanceOf[List[Union[This]]]
+      .asInstanceOf[List[Union[this.type]]]
 
   /** Create a copy of this tuple as an IArray */
   inline def toIArray: IArray[Object] =