SLING-8116 - ValueMap - implement default methods using OSGI Converter

* removed duplicate map lookup
diff --git a/src/main/java/org/apache/sling/api/wrappers/ValueMapDecorator.java b/src/main/java/org/apache/sling/api/wrappers/ValueMapDecorator.java
index d96e0d3..0ca5cdb 100644
--- a/src/main/java/org/apache/sling/api/wrappers/ValueMapDecorator.java
+++ b/src/main/java/org/apache/sling/api/wrappers/ValueMapDecorator.java
@@ -61,7 +61,7 @@
         if (type.isAssignableFrom(value.getClass())) {
             return (T)value;
         }
-        return ObjectConverter.convert(get(name), type);
+        return ObjectConverter.convert(value, type);
     }
 
     /**