Remove unnecessary configs from samples

spring-cloud-sleuth-samples/spring-cloud-sleuth-sample-zipkin-stream/src/main/resources/application.yml

@@ -4,6 +4,16 @@ server:
 spring:
   rabbitmq:
     host: ${RABBIT_HOST:localhost}
+  datasource:
+    initialize: false
+
+zipkin:
+  store:
+    type: mem # default is inMemory
+
+---
+spring:
+  profiles: mysql
   datasource:
     schema: classpath:/mysql.sql
     url: jdbc:mysql://${MYSQL_HOST:localhost}/test
@@ -17,12 +27,3 @@ spring:
 zipkin:
   store:
     type: mysql # default is inMemory
-
----
-spring:
-  profiles: test
-  datasource:
-    initialize: false
-zipkin:
-  store:
-    type: mem # default is inMemory