logviewer: reduce it back to 100

a lot of delay with 300

frontend/src/models/LogsModel.js

@@ -28,7 +28,7 @@ function ab2str(buf) {
 }
 
 export function create(origin, accessToken, type, id) {
-  const INITIAL_STREAM_LINES = 300;
+  const INITIAL_STREAM_LINES = 100;
 
   let eventSource = null;