Remove FocusListener from class that claims to implement it but doesn't

deob/src/main/java/dev/openrs2/deob/Deobfuscator.java

@@ -13,6 +13,7 @@ import dev.openrs2.asm.Library;
 import dev.openrs2.asm.Transformer;
 import dev.openrs2.deob.classpath.ClassPath;
 import dev.openrs2.deob.classpath.TypedRemapper;
+import dev.openrs2.deob.transform.CanvasTransformer;
 import dev.openrs2.deob.transform.ClassForNameTransformer;
 import dev.openrs2.deob.transform.ExceptionTracingTransformer;
 import dev.openrs2.deob.transform.OpaquePredicateTransformer;
@@ -25,7 +26,8 @@ public final class Deobfuscator {
 
 	private static final List<Transformer> TRANSFORMERS = List.of(
 		new OpaquePredicateTransformer(),
-		new ExceptionTracingTransformer()
+		new ExceptionTracingTransformer(),
+		new CanvasTransformer()
 	);
 
 	public static void main(String[] args) throws IOException {

deob/src/main/java/dev/openrs2/deob/transform/CanvasTransformer.java

@@ -0,0 +1,20 @@
+package dev.openrs2.deob.transform;
+
+import dev.openrs2.asm.Transformer;
+import org.objectweb.asm.Opcodes;
+import org.objectweb.asm.tree.ClassNode;
+
+public final class CanvasTransformer extends Transformer {
+	@Override
+	public void transformClass(ClassNode clazz) {
+		if (!"java/awt/Canvas".equals(clazz.superName)) {
+			return;
+		}
+
+		if ((clazz.access & Opcodes.ACC_FINAL) == 0) {
+			return;
+		}
+
+		clazz.interfaces.remove("java/awt/event/FocusListener");
+	}
+}