Revert "prowgen: generate stricter branch: stanzas for presubmits"

[droslean]

Reverts #2136

/cc @openshift/openshift-team-developer-productivity-test-platform

This change generates jobs with multiple branches which broke the rehearse tool.

    branches:
    - ^master$
    - ^master-

follow-up openshift/release#20014

[bbguimaraes]

/lgtm

[openshift-ci]

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[openshift-ci]

@droslean: The following test failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
ci/prow/breaking-changes	70a015f	link	/test breaking-changes

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