client.ssh.wrapper.state: rename local vars to avoid shadowing

```
************* Module salt.client.ssh.wrapper.state
salt/client/ssh/wrapper/state.py:39: [W0621(redefined-outer-name), sls] Redefining name 'high' from outer scope (line 118)
salt/client/ssh/wrapper/state.py:287: [W0621(redefined-outer-name), show_sls] Redefining name 'high' from outer scope (line 118)
salt/client/ssh/wrapper/state.py:314: [W0621(redefined-outer-name), show_top] Redefining name 'top' from outer scope (line 189)
```