tests: Remove builtin_dict test

This is essentially a duplicate of obj_dict.py

tests/basics/builtin_dict.py

@@ -1,11 +0,0 @@
-class A:
-    def __init__(self):
-        self.a=1
-        self.b=2
-
-try:
-    d=A().__dict__
-    print(d['a'])
-    print(d['b'])
-except AttributeError:
-    print("SKIP")