test: Fix --sit with avocado/selenium tests
test: Fix --sit with avocado/selenium tests

Avoid input(), as that doesn't work well with bilingual code.
Similar to what was done to the verify tests in commit 44e0fd48caa5c8.

Fixes this error:
```
  File "test/avocado/run-tests", line 262, in run_avocado
    input("Press RET to continue... ")
UnboundLocalError: local variable 'input' referenced before assignment
```

Closes #11281

moraleslazaro/cockpit,moraleslazaro/cockpit,cockpituous/cockpit,cockpituous/cockpit,mvollmer/cockpit,deryni/cockpit,deryni/cockpit,cockpituous/cockpit,deryni/cockpit,moraleslazaro/cockpit,mvollmer/cockpit,cockpit-project/cockpit,cockpit-project/cockpit,martinpitt/cockpit,mvollmer/cockpit,mvollmer/cockpit,martinpitt/cockpit,martinpitt/cockpit,deryni/cockpit,cockpit-project/cockpit,cockpituous/cockpit,deryni/cockpit,cockpit-project/cockpit,moraleslazaro/cockpit,moraleslazaro/cockpit,garrett/cockpit,cockpit-project/cockpit,mvollmer/cockpit,garrett/cockpit,cockpituous/cockpit,moraleslazaro/cockpit,martinpitt/cockpit,moraleslazaro/cockpit,garrett/cockpit,garrett/cockpit,cockpituous/cockpit,garrett/cockpit,deryni/cockpit,martinpitt/cockpit,deryni/cockpit