[KYUUBI #412] [MINOR] Simplify ProcBuilder code

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remove redundancy code, beause scala SAM will opt the code.

### _Why are the changes needed?_
just simpfy code

### _How was this patch tested?_
- [ ] Add some test cases that check the changes thoroughly including negative and positive cases if possible

- [ ] Add screenshots for manual tests if appropriate

- [ ] [Run test](https://kyuubi.readthedocs.io/en/latest/tools/testing.html#running-tests) locally before make a pull request

Closes #412 from MyLanPangzi/master.

2830118 [hiscat] Update ProcBuilder.scala
a368183 [hiscat] refacotor(kyuubi-main): fix code analysis error
f3f1bca [hiscat] refactor(kyuubi-main):  fix compile error
fb1b841 [hiscat] reafactor(kyuubi-main): simpfy ProcBuilder code

Lead-authored-by: MyLanPangzi <1251723871@qq.com>
Co-authored-by: hiscat <46845236+MyLanPangzi@users.noreply.github.com>
Signed-off-by: Kent Yao <yao@apache.org>

kyuubi-main/src/main/scala/org/apache/kyuubi/engine/ProcBuilder.scala

@@ -105,8 +105,8 @@ trait ProcBuilder {
     val proc = processBuilder.start()
     val reader = Files.newBufferedReader(engineLog.toPath, StandardCharsets.UTF_8)
 
-    val redirect = new Runnable {
-      override def run(): Unit = try {
+    val redirect: Runnable = { () =>
+      try {
         val maxErrorSize = conf.get(KyuubiConf.ENGINE_ERROR_MAX_SIZE)
         var line: String = reader.readLine
         while (true) {