fix(frontend): pass myClientID to collab() so receiveTransaction can match own steps and skip re-applying them

templates/document_edit.html

···
                 // so sendableSteps/receiveTransaction have a state slot to read from.
                 ctx.update(prosePluginsCtx, (plugins) => [
                     ...plugins,
-                    collab({ version: collabClient.version }),
+                    collab({ version: collabClient.version, clientID: myClientID }),
                 ]);
                 // Override dispatchTransaction to notify CollabClient after every
                 // local transaction. CollabClient calls sendableSteps itself at