dist/tools: Fixed names to m4a template generator

[CW-75]

Contribution description

Was changed the directory's name from m4a-generator to template_generator, also was fixed the source path of template_generator in the script m4a_installer.sh .

Testing procedure

You should has uninstalled pip and m4agen.
if previously has installed these tools

sudo pip uninstall m4agen
sudo apt remove pyhton3-pip

then run in the base directory:

make generate-example

Automatically, the makefile will offer you install pip and m4agen. Pip is offered as a dependency to run m4agen

Issues/PRs references

Fixes #334

[luisan00]

looks good for me, going ahead bro!