Remove setting of autoReleaseAfterClose.
Remove setting of autoReleaseAfterClose.

The previous attempt to use a build property for this setting did not
work as expected. The `nexus-staging-maven-plugin` ignored the system
property passed on the command line.

In addition, it turns out that this property is not necessary for two
reasons:

1.  The `autoReleaseAfterClose` property defaults to `false`. See:
    https://help.sonatype.com/repomanager2/staging-releases/configuring-your-project-for-deployment#ConfiguringYourProjectforDeployment-DeploymentwiththeNexusStagingMavenPlugin
2.  The `autoReleaseAfterClose` property can be passed via the command
    line already, so there's no point in introducing an intermediate
    build property that mirros the existing property. See:
    https://github.com/sonatype/nexus-maven-plugins/tree/master/staging/maven-plugin#plugin-flags

[deployautorel]

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