Update keywords

required by net-im/telegram-desktop-2.4.7::gentoo[webrtc]
required by @selected
required by @world (argument)
=media-libs/tg_owt-0_pre20201105 ~amd64

profiles/default/package.keywords/depends

@@ -806,6 +806,7 @@
 ~media-libs/speexdsp-1.2_rc3 amd64
 ~media-libs/suil-0.10.0 amd64
 ~media-libs/taglib-1.11.1_p20181028 amd64
+~media-libs/tg_owt-0_pre20201105 amd64
 ~media-libs/vigra-1.11.1 amd64
 ~media-libs/webvfx-1.2.0 amd64
 ~media-libs/x265-3.4 amd64