[flang][runtime] Fix total MAXLOC/MINLOC for non-integer data

A template argument was hard-coded as the Integer type category
rather than properly forwarding the type category of the data for
type-specific instantiations of total (no DIM=) MAXLOC and MINLOC.
This broke total MAXLOC and MINLOC reductions for real and character
data.

Differential Revision: https://reviews.llvm.org/D124303