Fix WildTypePattern.isArray

The method falsely determined that a one-dimensional array was not an
array due to a one-off bug.

Relates to https://github.com/eclipse/org.aspectj/issues/24.

Signed-off-by: Alexander Kriegisch <Alexander@Kriegisch.name>

org.aspectj.matcher/src/main/java/org/aspectj/weaver/patterns/WildTypePattern.java

 
 	@Override
 	public boolean isArray() {
-		return dim > 1;
+		return dim > 0;
 	}
 
 	/**