Opening OpenPGP Applet multiple times creates as many icons in the task bar

Until Tails 2.5, there was no OpenPGP applet launcher in the Applications menu. In Tails 2.6~rc1, there is one, and then, when opening OpenPGP Applet through Applications → Accessories → OpenPGP Applet it creates an icon in the task bar (top right). Where an OpenPGP Applet already exists by the way. And clicking x times creates x identical icons.

Feature Branch: bugfix/11781-hide-openpgp-applet-launcher

Related issues

Related to #7435

Original created by @mercedes508 on 11781 (Redmine)

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