[filter box] filter box should not require another filter selection other than time

[vylc]

New filter box should not require additional fields to be filtered in order to work. (as time is already by default selected)

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• I have checked the superset logs for python stacktraces and included it here as text if there are any.
• I have reproduced the issue with at least the latest released version of superset.
• I have checked the issue tracker for the same issue and I haven't found one similar.

Superset version

Expected results

Actual results

Steps to reproduce

[vylc]

@mistercrunch i know you had a lot of recent fixes to filter box--is this one included in one of the PRs?

[stale]

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