Remove redundant defaults of PasswordSelector

[kajinamit]

We define defaults in two layers but this is redundant. This change attempts to define defaults in the single layer instead.

[kajinamit]

/hold

[openshift-ci]

@kajinamit: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/precommit-check	5428241	link	true	/test precommit-check

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[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: bshephar, kajinamit

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[bshephar]

Looks like it's just complaining about:

 # github.com/openstack-k8s-operators/heat-operator/api/v1beta1
api/v1beta1/common_types.go:92:2: C003: Field 'Database' has both a 'Optional' kubebuilder marker with a default value and an 'omitempty' tag. Either remove the default value or remove 'omitempty'
api/v1beta1/common_types.go:96:2: C003: Field 'Service' has both a 'Optional' kubebuilder marker with a default value and an 'omitempty' tag. Either remove the default value or remove 'omitempty'
api/v1beta1/common_types.go:100:2: C003: Field 'AuthEncryptionKey' has both a 'Optional' kubebuilder marker with a default value and an 'omitempty' tag. Either remove the default value or remove 'omitempty' 

[bshephar]

/test heat-operator-build-deploy-kuttl