refactor(pom): update project name for clarity in custom UI description

Author: SteKoe

spring-boot-admin-samples/spring-boot-admin-sample-custom-ui/pom.xml

@@ -21,7 +21,7 @@
 
     <artifactId>spring-boot-admin-sample-custom-ui</artifactId>
 
-    <name>Spring Boot Admin Server custom UI</name>
+    <name>Spring Boot Admin Sample Custom UI</name>
     <description>Spring Boot Admin Server custom UI</description>
 
     <parent>