Revert "Do not raise an error if incomplete classpath is allowed oracle#2556"

This reverts commit ea98895.

Author: zakkak

substratevm/src/com.oracle.svm.hosted/src/com/oracle/svm/hosted/classinitialization/ClassInitializationFeature.java

@@ -394,7 +394,7 @@ static boolean declaresDefaultMethods(ResolvedJavaType type) {
             }
             return false;
         } catch (NoClassDefFoundError e) {
-            if (NativeImageOptions.AllowIncompleteClasspath.getValue()) {
+            if (!NativeImageOptions.AllowIncompleteClasspath.getValue()) {
                 return false;
             }