Polish ternary expressions

Consistently format ternary expressions and always favor `!=` as the
the check.

spring-boot-project/spring-boot-cli/src/main/java/org/springframework/boot/cli/command/options/SourceOptions.java

@@ -130,7 +130,7 @@ public class SourceOptions {
 	}
 
 	private String asString(Object arg) {
-		return (arg == null ? null : String.valueOf(arg));
+		return (arg != null ? String.valueOf(arg) : null);
 	}
 
 	public List<String> getSources() {

spring-boot-project/spring-boot-cli/src/test/java/org/springframework/boot/cli/CliTester.java

@@ -154,7 +154,7 @@ public class CliTester implements TestRule {
 				}
 			}
 			else {
-				sources[i] = new File(arg).isAbsolute() ? arg : this.prefix + arg;
+				sources[i] = (new File(arg).isAbsolute() ? arg : this.prefix + arg);
 			}
 		}
 		return sources;