[SPARK-27715][SQL][UI] SQL query details in UI does not show in correct format

## What changes were proposed in this pull request?

before pr:
![image](https://user-images.githubusercontent.com/7402327/57752168-bb7e9180-771a-11e9-8757-63236ecab753.png)

after pr:
![image](https://user-images.githubusercontent.com/7402327/57752175-c802ea00-771a-11e9-96fd-aef1890b7985.png)

## How was this patch tested?

manual test

Closes #24609 from uncleGen/SPARK-27715.

Authored-by: uncleGen <hustyugm@gmail.com>
Signed-off-by: Sean Owen <sean.owen@databricks.com>

Author: uncleGen

sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/StreamExecution.scala

@@ -578,8 +578,10 @@ abstract class StreamExecution(
 
   protected def getBatchDescriptionString: String = {
     val batchDescription = if (currentBatchId < 0) "init" else currentBatchId.toString
-    Option(name).map(_ + "<br/>").getOrElse("") +
-      s"id = $id<br/>runId = $runId<br/>batch = $batchDescription"
+    s"""|${Option(name).getOrElse("")}
+        |id = $id
+        |runId = $runId
+        |batch = $batchDescription""".stripMargin
   }
 
   protected def createStreamingWrite(