tests: Adapt basics/memoryerror.py for ports with lower heap sizes.

tests/basics/memoryerror.py

-l = list(range(10000))
+l = list(range(1000))
 try:
-    100000000 * l
+    1000000000 * l
 except MemoryError:
     print('MemoryError')
 print(len(l), l[0], l[-1])

tests/basics/memoryerror.py.exp

 MemoryError
-10000 0 9999
+1000 0 999