Undo the previous fix to ParameterInfo.GetCustomAttributes

There is a better change in RuntimeParameterInfo.cs to
address this.

Author: bholmes

mcs/class/corlib/System/MonoCustomAttrs.cs

@@ -183,9 +183,6 @@ internal static object[] GetCustomAttributes (ICustomAttributeProvider obj, Type
 			if (inherit && GetBase (obj) == null)
 				inherit = false;
 
-			if (obj is RuntimeParameterInfo)
-				inherit = false;
-
 			// if AttributeType is sealed, and Inherited is set to false, then 
 			// there's no use in scanning base types 
 			if ((attributeType != null && attributeType.IsSealed) && inherit) {