ui_event_filters can't turn categories off and back on again

Description of the problem / feature request:

$ bazel test //main-street/...
INFO: Invocation ID: fc830a0d-802f-47a5-a356-2adc9220dc5d
INFO: Analyzed 370 targets (0 packages loaded, 0 targets configured).
INFO: Found 262 targets and 108 test targets...
INFO: Elapsed time: 0.464s, Critical Path: 0.01s
INFO: 1 process: 1 internal.
INFO: Build completed successfully, 1 total action
Test cases: finished with 4247 passing and 0 failing out of 4248 test cases (some targets did not have test case information)

INFO: Build completed successfully, 1 total action
$ bazel test //main-street/... --ui_event_filters=-INFO
INFO: Build completed successfully, 1 total action
Test cases: finished with 4247 passing and 0 failing out of 4248 test cases (some targets did not have test case information)

INFO: Build completed successfully, 1 total action
$ bazel test //main-street/... --ui_event_filters=-INFO --ui_event_filters=+INFO
INFO: Build completed successfully, 1 total action
Test cases: finished with 4247 passing and 0 failing out of 4248 test cases (some targets did not have test case information)

INFO: Build completed successfully, 1 total action

This problem manifests itself it I want my default configuration to be -INFO for my organization, but if I want to give them a --config=verbose mode to turn the events back on.

Feature requests: what underlying problem are you trying to solve with this feature?

For the bazel test //main-street/... --ui_event_filters=-INFO --ui_event_filters=+INFO above to match the output of bazel test //main-street/...

Bugs: what's the simplest, easiest way to reproduce this bug? Please provide a minimal example if possible.

Run the above but with your own target

What operating system are you running Bazel on?

OS X

What's the output of bazel info release?

$ bazel info release
INFO: Invocation ID: b5577e66-63ff-46c4-8c9c-86738498c8f5
release 3.7.2

Have you found anything relevant by searching the web?

https://github.com/bazelbuild/bazel/issues?q=is%3Aissue+is%3Aopen+ui_event_filters

Any other information, logs, or outputs that you want to share?

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