Fix BytesWarning in ssh.interactive() (Gallopsled#2218)

When the current working directory was changed, `interactive()` changes
into that directory using `cd X` which wasn't encoded.

Author: peace-maker

pwnlib/tubes/ssh.py

@@ -1766,7 +1766,7 @@ def interactive(self, shell=None):
 
         if self.cwd != '.':
             cmd = 'cd ' + sh_string(self.cwd)
-            s.sendline(cmd)
+            s.sendline(packing._need_bytes(cmd, 2, 0x80))
 
         s.interactive()
         s.close()