Update challenges for simple challenge image

hello/apple/apple

@@ -1,4 +1,4 @@
-#!/opt/pwn.college/python
+#!/usr/bin/exec-suid -- /usr/local/bin/python -I
 
 with open("/flag") as f:
     print(f.read())

hello/banana/banana

@@ -1,4 +1,4 @@
-#!/opt/pwn.college/python
+#!/usr/bin/exec-suid -- /usr/local/bin/python -I
 
 import pathlib