Java2Swift: Don't omit "extends" clause when it's extending JavaObject

There's no reason to skip this; be more regular about it.

Author: DougGregor

Sources/Java2SwiftLib/JavaClassTranslator.swift

@@ -110,10 +110,7 @@ struct JavaClassTranslator {
     self.nestedClasses = translator.nestedClasses[fullName] ?? []
 
     // Superclass.
-    if !javaClass.isInterface(),
-      let javaSuperclass = javaClass.getSuperclass(),
-      javaSuperclass.getName() != "java.lang.Object"
-    {
+    if !javaClass.isInterface(), let javaSuperclass = javaClass.getSuperclass() {
       do {
         self.swiftSuperclass = try translator.getSwiftTypeName(javaSuperclass).swiftName
       } catch {

Tests/Java2SwiftTests/Java2SwiftTests.swift

@@ -69,7 +69,7 @@ class Java2SwiftTests: XCTestCase {
       expectedChunks: [
         "import JavaKit",
         """
-        @JavaClass("java.lang.Class")
+        @JavaClass("java.lang.Class", extends: JavaObject.self)
         public struct MyJavaClass<T: AnyJavaObject> {
         """,
         """