Fix styling issue

- For title styling change from bold,fg:bright-white
  to bold which should work better with different
  terminal color settings as forcing it into bright white
  is a bad idea.
- Fixes #476

spring-shell-core/src/main/java/org/springframework/shell/style/StyleSettings.java

@@ -92,7 +92,7 @@ public abstract class StyleSettings {
 	public final static String TAG_HIGHLIGHT = "style-highlight";
 
 	public String title() {
-		return "bold,fg:bright-white";
+		return "bold";
 	}
 
 	public String value() {