updated sheesh

services/sheesh/src/chall.py

@@ -13,7 +13,7 @@ S1 = os.urandom(16)
 M0 = os.urandom(16)
 M1 = os.urandom(16)
 
-with open("./flag.txt","rb") as f:
+with open("/flag.txt","rb") as f:
     flag = f.read()
 
 def hex_input(q):