Make @Override annotations invisible

Normally they wouldn't be retained in the bytecode at all, but for obvious
reasons we can't do that! Making them invisible is at least closer to the
RetentionPolicy's intention than a visible annotation.

deob/src/main/java/dev/openrs2/deob/transform/OverrideTransformer.kt

@@ -32,14 +32,14 @@ class OverrideTransformer : Transformer() {
             return false
         }
 
-        if (method.visibleAnnotations != null && method.visibleAnnotations.any { it.desc == OVERRIDE_DESC }) {
+        if (method.invisibleAnnotations != null && method.invisibleAnnotations.any { it.desc == OVERRIDE_DESC }) {
             return false
         }
 
-        if (method.visibleAnnotations == null) {
-            method.visibleAnnotations = mutableListOf()
+        if (method.invisibleAnnotations == null) {
+            method.invisibleAnnotations = mutableListOf()
         }
-        method.visibleAnnotations.add(AnnotationNode(OVERRIDE_DESC))
+        method.invisibleAnnotations.add(AnnotationNode(OVERRIDE_DESC))
         overrides++
 
         return false