Bump xterm-addon-webgl in /terminus-terminal

Bumps [xterm-addon-webgl](https://github.com/xtermjs/xterm.js) from 0.2.0-beta6 to 0.2.0-beta7.
- [Release notes](https://github.com/xtermjs/xterm.js/releases)
- [Commits](https://github.com/xtermjs/xterm.js/commits)
Signed-off-by: Ndependabot-preview[bot] <support@dependabot.com>

terminus-terminal/yarn.lock

@@ -232,9 +232,9 @@ xterm-addon-search@^0.2.0-beta1:
   integrity sha512-dKP9MW+X2LUco+MgT6cL7ytCtbtsaXFdDjZbJQoBEkU7Z8kxgJft8saKhGYjg+4nrFkSqocqGIaLEBMaZhjoFw==
 
 xterm-addon-webgl@^0.2.0-beta1:
-  version "0.2.0-beta6"
-  resolved "https://registry.yarnpkg.com/xterm-addon-webgl/-/xterm-addon-webgl-0.2.0-beta6.tgz#308464aebc6002f04514673e5233fe237df76d7f"
-  integrity sha512-KPGv5VPzeZWmqHIuR73UOD/eMSLG2mi57qQCrjYUMOQK9PPFfm5KQtYmCfK+DhNUWqrs5dpGbFFLv3lfwVghcg==
+  version "0.2.0-beta7"
+  resolved "https://registry.yarnpkg.com/xterm-addon-webgl/-/xterm-addon-webgl-0.2.0-beta7.tgz#b43f9e9edae52386b87c1834ca4385b37be3d4a9"
+  integrity sha512-5rFvt27qVJ6nf3WunLyc4qeZoUg9JugE6J911yKTgH4TFLjoDnYv5Q5CYn4W0yX084Frq8tL2tZVy0KXVXJ7Lg==
 
 xterm@3.15.0-beta98:
   version "3.15.0-beta98"