core: remove 'static' modifier for inner interfaces

jadx-core/src/main/java/jadx/core/codegen/ClassGen.java

@@ -119,7 +119,8 @@ public class ClassGen {
 	public void addClassDeclaration(CodeWriter clsCode) {
 		AccessInfo af = cls.getAccessFlags();
 		if (af.isInterface()) {
-			af = af.remove(AccessFlags.ACC_ABSTRACT);
+			af = af.remove(AccessFlags.ACC_ABSTRACT)
+					.remove(AccessFlags.ACC_STATIC);
 		} else if (af.isEnum()) {
 			af = af.remove(AccessFlags.ACC_FINAL)
 					.remove(AccessFlags.ACC_ABSTRACT)

jadx-core/src/main/java/jadx/core/dex/info/AccessInfo.java

@@ -25,10 +25,9 @@ public class AccessInfo {
 
 	public AccessInfo remove(int flag) {
 		if (containsFlag(flag)) {
-			return new AccessInfo(accFlags - flag, type);
-		} else {
-			return this;
+			return new AccessInfo(accFlags & ~flag, type);
 		}
+		return this;
 	}
 
 	public AccessInfo getVisibility() {

jadx-core/src/test/java/jadx/tests/integration/TestClassGen.java

@@ -12,7 +12,7 @@ import static org.junit.Assert.assertThat;
 public class TestClassGen extends IntegrationTest {
 
 	public static class TestCls {
-		public static interface I {
+		public interface I {
 			int test();
 
 			public int test3();
@@ -28,7 +28,7 @@ public class TestClassGen extends IntegrationTest {
 		ClassNode cls = getClassNode(TestCls.class);
 		String code = cls.getCode().toString();
 
-		assertThat(code, containsString("public static interface I {"));
+		assertThat(code, containsString("public interface I {"));
 		assertThat(code, containsString(indent(2) + "int test();"));
 		assertThat(code, not(containsString("public int test();")));
 		assertThat(code, containsString(indent(2) + "int test3();"));

jadx-core/src/test/java/jadx/tests/integration/annotations/TestAnnotations2.java

@@ -19,7 +19,7 @@ public class TestAnnotations2 extends IntegrationTest {
 
 		@Target({ElementType.TYPE})
 		@Retention(RetentionPolicy.RUNTIME)
-		public static @interface A {
+		public @interface A {
 			int i();
 
 			float f();
@@ -33,7 +33,7 @@ public class TestAnnotations2 extends IntegrationTest {
 
 		assertThat(code, containsString("@Target({ElementType.TYPE})"));
 		assertThat(code, containsString("@Retention(RetentionPolicy.RUNTIME)"));
-		assertThat(code, containsString("public static @interface A {"));
+		assertThat(code, containsString("public @interface A {"));
 		assertThat(code, containsString("float f();"));
 		assertThat(code, containsString("int i();"));
 	}