deps: update ljm

package-lock.json

       }
     },
     "lib-jitsi-meet": {
-      "version": "github:jitsi/lib-jitsi-meet#4e9319b10acc9a3abf58d51bd7512174673b5a39",
-      "from": "github:jitsi/lib-jitsi-meet#4e9319b10acc9a3abf58d51bd7512174673b5a39",
+      "version": "github:jitsi/lib-jitsi-meet#dffe94f270f692c7421412bbbc597279e4a2d805",
+      "from": "github:jitsi/lib-jitsi-meet#dffe94f270f692c7421412bbbc597279e4a2d805",
       "requires": {
         "@jitsi/sdp-interop": "1.0.2",
         "@jitsi/sdp-simulcast": "0.3.0",

package.json

     "js-utils": "github:jitsi/js-utils#df68966e3c65b5c57fcd2670da1326a2c77518d1",
     "jsrsasign": "8.0.12",
     "jwt-decode": "2.2.0",
-    "lib-jitsi-meet": "github:jitsi/lib-jitsi-meet#4e9319b10acc9a3abf58d51bd7512174673b5a39",
+    "lib-jitsi-meet": "github:jitsi/lib-jitsi-meet#dffe94f270f692c7421412bbbc597279e4a2d805",
     "libflacjs": "github:mmig/libflac.js#93d37e7f811f01cf7d8b6a603e38bd3c3810907d",
     "lodash": "4.17.13",
     "moment": "2.19.4",