Fix typo.

scripts/prompt.py

@@ -128,4 +128,4 @@ while 1:
             command = '"%s"' % command
 
         data = urlencode({"op": "set_input", "value": command, "taskname": taskname})
-        urlopen(Request(address, data.encode(qgit))).read()
+        urlopen(Request(address, data.encode())).read()