[Bindings] Fix Vec/Mat template types

[fredroy]

introduced by SOFA #1515

[jnbrunet]

Hey @fredroy ,

Thanks for this PR. The CI is failing to build tho:

 bindings/SofaTypes/src/SofaPython3/SofaTypes/Binding_Mat.cpp:174:31: error: no type named 'Size' in namespace 'sofa'
template <sofa::Size R, sofa::Size C> struct MATRIX {

Could it be missing a header somewhere?

[fredroy]

err... Index and Type are located in Sofa/config.h(.in) so I dont think so 👼 (since SOFA PR #1515)

[jnbrunet]

CI on macos still fail to build, but it isn't related to this PR (wrong SOFA nightly build again...)
CI on linux built correctly

I'll merge this since it is blocking for people following the master branch of SOFA