Polish JavaBeanBinder

Closes gh-33762

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/context/properties/bind/JavaBeanBinder.java

@@ -304,15 +304,11 @@ class JavaBeanBinder implements DataObjectBinder {
 		}
 
 		void addGetter(Method getter) {
-			if (this.getter == null || isBetterGetter(getter)) {
+			if (this.getter == null || this.getter.getName().startsWith("is")) {
 				this.getter = getter;
 			}
 		}
 
-		private boolean isBetterGetter(Method getter) {
-			return this.getter != null && this.getter.getName().startsWith("is");
-		}
-
 		void addSetter(Method setter) {
 			if (this.setter == null || isBetterSetter(setter)) {
 				this.setter = setter;