[MINOR] More than 100 chars in line in SparkSubmitCommandBuilderSuite

## What changes were proposed in this pull request?
More than 100 chars in line.

## How was this patch tested?

Author: Sandeep Singh <sandeep@techaddict.me>

Closes #13249 from techaddict/fix-1.

launcher/src/test/java/org/apache/spark/launcher/SparkSubmitCommandBuilderSuite.java

@@ -67,7 +67,8 @@ public class SparkSubmitCommandBuilderSuite extends BaseSuite {
 
     List<String> sparkEmptyArgs = Collections.emptyList();
     cmd = buildCommand(sparkEmptyArgs, env);
-    assertTrue("org.apache.spark.deploy.SparkSubmit should be contained in the final cmd of empty input.",
+    assertTrue(
+      "org.apache.spark.deploy.SparkSubmit should be contained in the final cmd of empty input.",
       cmd.contains("org.apache.spark.deploy.SparkSubmit"));
   }