wayland: add more mostly leaf ports to virtual category

Caveats:

• emulators/rpcs3: install qt5-wayland and ensure Renderer is Vulkan (default)
• mail/thunderbird: add MOZ_ENABLE_WAYLAND=1 via environ(7)
• www/chromium: add --ozone-platform=wayland on command line
• www/firefox-esr: add MOZ_ENABLE_WAYLAND=1 via environ(7)
• www/firefox: add MOZ_ENABLE_WAYLAND=1 via environ(7)