fix：

头像缓存bug修复

tr-framework/src/main/java/cn/tr/core/utils/AvatarUtil.java

@@ -147,7 +147,7 @@ public class AvatarUtil {
         }catch (Exception e){
             result="";
         }
-        avatarMap.put(key,result);
+        avatarMap.put(key,"data:image/png;base64,"+result);
         return "data:image/png;base64,"+result;
     }