fix: add missing import for class generics map (PR #480)

* Fix missing import for class Generics map.
* Add import only when needed (in non-inner class declaration)
* Remove unneeded import

jadx-core/src/test/java/jadx/tests/integration/generics/TestImportGenericMap.java

@@ -0,0 +1,40 @@
+package jadx.tests.integration.generics;
+
+import static org.hamcrest.CoreMatchers.containsString;
+import static org.hamcrest.CoreMatchers.not;
+import static org.junit.Assert.assertThat;
+
+import org.junit.Test;
+
+import jadx.core.dex.nodes.ClassNode;
+import jadx.tests.api.IntegrationTest;
+
+public class TestImportGenericMap extends IntegrationTest {
+
+	@Test
+	public void test() {
+		ClassNode cls = getClassNode(SuperClass.class);
+		String code = cls.getCode().toString();
+
+		assertThat(code, containsString(
+				"import " + SuperClass.ToImport.class.getName().replace('$', '.') + ';'));
+		assertThat(code, not(containsString(
+				"import " + SuperClass.NotToImport.class.getName().replace('$', '.') + ';')));
+	}
+}
+
+final class SuperClass<O extends SuperClass.ToImport> {
+
+    interface ToImport {
+    }
+
+    interface NotToImport {
+    }
+
+    static final class Class1<C extends NotToImport> {
+    }
+
+    public <C extends NotToImport> SuperClass(Class1<C> zzf) {
+    }
+
+}