[Applet]Improvements for unavailable port.
Summary: Restore capability of unavailable ports to be active, which was prevented with 10ab204a. Enable port selection in case an unavailable port is active. Test Plan: Before: Choosing an unavailable port from pavucontrol was impossible. After: Activating an unavailable port is possible. Can test with D27422. Reviewers: #plasma, drosca, ngraham Reviewed By: ngraham Subscribers: pino, plasma-devel Tags: #plasma Differential Revision: https://phabricator.kde.org/D27420
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