Fix e3-pypi-closure name comparison

Before this patch, if you had a requirement like 'Django==2.2',
the version constraint would be ignored because the code was trying to
compare 'Django' == 'django'

Now we don't have to worry about character case in this comparison,
which corrects the problem.

src/e3/python/pypi.py

@@ -341,7 +341,7 @@ def add_constraint(self, requirement: Requirement) -> None:
         """
         logging.debug(f"Apply constraint: {str(requirement)}")
         # Check if requirement applies to that package
-        if canonicalize_name(requirement.name) != self.name:
+        if canonicalize_name(requirement.name) != canonicalize_name(self.name):
             return
 
         # Check platforms