Fix lint missed by flake8<5

Author: inducer

pymbolic/interop/maxima.py

@@ -246,7 +246,7 @@ def make_setup(assignment):
             return assignment
         if isinstance(assignment, tuple):
             name, value = assignment
-            return"{}: {}".format(name, strify(value))
+            return "{}: {}".format(name, strify(value))
         else:
             return strify(assignment)