Remove usages of Buffer

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

src/utils/WidgetUtils.ts

@@ -445,7 +445,7 @@ export default class WidgetUtils {
             // For compatibility with Jitsi, use base32 without padding.
             // More details here:
             // https://github.com/matrix-org/prosody-mod-auth-matrix-user-verification
-            confId = base32.stringify(Buffer.from(roomId), { pad: false });
+            confId = base32.stringify(new TextEncoder().encode(roomId), { pad: false });
         } else {
             // Create a random conference ID
             confId = `Jitsi${randomUppercaseString(1)}${randomLowercaseString(23)}`;

src/utils/exportUtils/HtmlExport.tsx

@@ -431,7 +431,7 @@ export default class HTMLExporter extends Exporter {
                 !this.needsDateSeparator(event, prevEvent) &&
                 shouldFormContinuation(prevEvent, event, this.room.client, false);
             const body = await this.createMessageBody(event, shouldBeJoined);
-            this.totalSize += Buffer.byteLength(body);
+            this.totalSize += new TextEncoder().encode(body).byteLength;
             content += body;
             prevEvent = event;
         }