tests: Move super-as-local test from cpydiff to basic tests.

It's now possible to use the name "super" as a local variable.

tests/basics/class_super_aslocal.py

@@ -0,0 +1,9 @@
+# test using the name "super" as a local variable
+
+class A:
+    def foo(self):
+        super = [1, 2]
+        super.pop()
+        print(super)
+
+A().foo()

tests/cpydiff/core_class_superaslocal.py

@@ -1,13 +0,0 @@
-"""
-categories: Core,Classes
-description: Bug when using "super" as a local
-cause: Unknown
-workaround: Unknown
-"""
-class A:
-    def foo(self):
-        super = [1]
-        super.pop()
-        print(super)
-
-A().foo()