clang fix for narrowing
pcsx2: remove template and pointer on overload function from wxGuiTools

Fixed clang build.

Note from Gregory:
C++ requests that at least 1 parameters is a class, an enumeration, or a
reference to those objects. Probably to avoid to screw basic type operation.
For example: *p += 4;

The realy buggy code was this one because T could be an int!
template T
f(*ptr, T)

To avoid any issue in the future the Team decide to drop all overload that use pointers.