feat(base/icon): removed burger icon (#12876)

* feat(base/icons): removed unused icon

react/features/base/icons/svg/burger.svg

@@ -1,5 +0,0 @@
-<svg width="24" height="24" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg">
-    <path d="M1.5 6.75C1.5 6.33579 1.83579 6 2.25 6H21.75C22.1642 6 22.5 6.33579 22.5 6.75C22.5 7.16421 22.1642 7.5 21.75 7.5H2.25C1.83579 7.5 1.5 7.16421 1.5 6.75Z" />
-    <path d="M1.5 17.25C1.5 16.8358 1.83579 16.5 2.25 16.5H21.75C22.1642 16.5 22.5 16.8358 22.5 17.25C22.5 17.6642 22.1642 18 21.75 18H2.25C1.83579 18 1.5 17.6642 1.5 17.25Z" />
-    <path d="M2.25 11.25C1.83579 11.25 1.5 11.5858 1.5 12C1.5 12.4142 1.83579 12.75 2.25 12.75H21.75C22.1642 12.75 22.5 12.4142 22.5 12C22.5 11.5858 22.1642 11.25 21.75 11.25H2.25Z" />
-</svg>

react/features/base/icons/svg/index.ts

@@ -47,7 +47,6 @@ export { default as IconHelp } from './help.svg';
 export { default as IconHighlight } from './highlight.svg';
 export { default as IconImage } from './image.svg';
 export { default as IconInfoCircle } from './info-circle.svg';
-export { default as IconBurger } from './burger.svg';
 export { default as IconMessage } from './message.svg';
 export { default as IconMeter } from './meter.svg';
 export { default as IconMic } from './mic.svg';