feat(recording): new icon when recording is active (#2884)

- Update font files to add new icon.
- Update markup and style so the icon has a small background
  to fill in the text of the icon.
- Remove some css transitions that don't seem to do much.

fonts/jitsi.svg

@@ -68,4 +68,5 @@
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 <glyph unicode="&#xe929;" glyph-name="SD" d="M512 0c-282.77 0-512 229.23-512 512s229.23 512 512 512c282.77 0 512-229.23 512-512s-229.23-512-512-512zM281.6 451.175c1.925-47.075 40.95-76.65 101.15-76.65 63.35 0 102.375 31.15 102.375 82.075 0 39.2-21.875 61.075-72.625 71.75l-30.45 6.475c-29.575 6.3-41.65 15.225-41.65 30.8 0 19.25 17.5 31.5 43.925 31.5 25.55 0 44.1-13.3 46.55-33.25h49.7c-1.575 44.975-40.95 76.125-96.6 76.125-58.275 0-96.6-31.325-96.6-78.925 0-38.5 22.575-62.475 68.6-72.1l32.9-7c30.975-6.65 43.575-15.925 43.575-32.025 0-19.075-19.425-32.375-46.9-32.375-29.75 0-50.4 13.125-52.85 33.6h-51.1zM535 633.7v-252.7h99.4c75.6 0 118.475 46.025 118.475 128.1 0 79.1-43.4 124.6-118.475 124.6h-99.4zM587.85 588.55v-162.4h38.15c46.725 0 72.975 28.7 72.975 82.075 0 51.1-27.125 80.325-72.975 80.325h-38.15z" />
 <glyph unicode="&#xe92a;" glyph-name="camera-take-picture" d="M725.333 512c0-117.821-95.513-213.333-213.333-213.333s-213.333 95.513-213.333 213.333c0 117.821 95.513 213.333 213.333 213.333s213.333-95.513 213.333-213.333zM512 256c141.385 0 256 114.615 256 256s-114.615 256-256 256v0c-141.385 0-256-114.615-256-256s114.615-256 256-256v0zM512 213.333c-164.949 0-298.667 133.718-298.667 298.667s133.718 298.667 298.667 298.667v0c164.949 0 298.667-133.718 298.667-298.667s-133.718-298.667-298.667-298.667v0z" />
+<glyph unicode="&#xe92b;" glyph-name="rec" d="M512 0c-282.77 0-512 229.23-512 512s229.23 512 512 512c282.77 0 512-229.23 512-512s-229.23-512-512-512zM581.333 433.782h-110.595v59.233h104.338v40.332h-104.338v56.87h110.595v43.539h-161.665v-243.512h161.665v43.539zM738.771 384c58.849 0 101.802 36.282 106.029 88.933h-49.717c-4.904-26.832-26.888-44.045-56.143-44.045-38.556 0-62.4 31.895-62.4 83.196s23.844 83.027 62.231 83.027c29.086 0 51.239-18.394 56.143-46.407h49.717c-3.72 52.989-48.026 91.296-105.86 91.296-70.855 0-114.485-48.77-114.485-127.916 0-79.314 43.798-128.084 114.485-128.084zM230.27 478.502h41.769l45.489-88.258h57.834l-51.408 96.19c28.072 11.138 44.306 38.138 44.306 69.189 0 48.432-32.976 78.133-86.582 78.133h-102.478v-243.512h51.070v88.258zM230.27 592.58v-74.927h44.813c25.704 0 40.754 13.838 40.754 37.295 0 23.119-15.896 37.632-41.262 37.632h-44.306z" />
 </font></defs></svg>