Add config to skip widget_build_url for DM rooms (#11044)

* Add config to skip widget_build_url for DM rooms

* Add tests

src/IConfigOptions.ts

@@ -106,6 +106,7 @@ export interface IConfigOptions {
     };
 
     widget_build_url?: string; // url called to replace jitsi/call widget creation
+    widget_build_url_ignore_dm?: boolean;
     audio_stream_url?: string;
     jitsi?: {
         preferred_domain: string;