Bugfix: Use template argument X for input vector type

This method should really be removed in favor of mtv().

[[Imported from SVN: r1125]]

dune/istl/matrix.hh

@@ -282,7 +282,7 @@ namespace Dune {
 
     //! Multiplication of the transposed matrix times a vector
     template <class X, class Y>
-    Y transposedMult(const Y& vec) {
+    Y transposedMult(const X& vec) {
 #ifdef DUNE_ISTL_WITH_CHECKING
       if (N()!=vec.size())
         DUNE_THROW(ISTLError, "Vector size doesn't match the number of matrix rows!");