…Makefiles. (#6666)

Switching between master and develop branches can result in controller directories sticking around that only contain the results of a build on the previous branch. test_suite.py was trying (and failing) to run make in those directories.

* Replace reference to raw github content with webots:// in ShapeWithFixedWebTexture.proto.

The reference to a file in the github develop branch was causing that file to be left as changed when running test_suite.py in the develop branch.