[flang][hlfir] fix missing conversion in transpose simplification

It seems just replacing the operation was not replacing all of the uses
when the types of the expression before and after this pass differ (due
to differing shape information). Now the shape information is always
kept the same.

This fixes https://github.com/llvm/llvm-project/issues/63399

Differential Revision: https://reviews.llvm.org/D153333