Minor style hot fix after #2711

I had planned to fix this when I merged it but I forgot to. witgo

Author: Andrew Or <andrew@databricks.com>

Closes #3018 from andrewor14/command-utils-style and squashes the following commits:

c2959fb [Andrew Or] Style hot fix

core/src/main/scala/org/apache/spark/deploy/worker/CommandUtils.scala

@@ -37,12 +37,12 @@ object CommandUtils extends Logging {
    * The `env` argument is exposed for testing.
    */
   def buildProcessBuilder(
-    command: Command,
-    memory: Int,
-    sparkHome: String,
-    substituteArguments: String => String,
-    classPaths: Seq[String] = Seq[String](),
-    env: Map[String, String] = sys.env): ProcessBuilder = {
+      command: Command,
+      memory: Int,
+      sparkHome: String,
+      substituteArguments: String => String,
+      classPaths: Seq[String] = Seq[String](),
+      env: Map[String, String] = sys.env): ProcessBuilder = {
     val localCommand = buildLocalCommand(command, substituteArguments, classPaths, env)
     val commandSeq = buildCommandSeq(localCommand, memory, sparkHome)
     val builder = new ProcessBuilder(commandSeq: _*)