Android: Convert PostProcessing to Kotlin

Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/features/settings/model/PostProcessing.java

@@ -1,17 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-
-package org.dolphinemu.dolphinemu.features.settings.model;
-
-import androidx.annotation.NonNull;
-
-public class PostProcessing
-{
-  @NonNull
-  public static native String[] getShaderList();
-
-  @NonNull
-  public static native String[] getAnaglyphShaderList();
-
-  @NonNull
-  public static native String[] getPassiveShaderList();
-}

Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/features/settings/model/PostProcessing.kt

@@ -0,0 +1,17 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+package org.dolphinemu.dolphinemu.features.settings.model
+
+object PostProcessing {
+    @JvmStatic
+    val shaderList: Array<String?>
+        external get
+
+    @JvmStatic
+    val anaglyphShaderList: Array<String?>
+        external get
+
+    @JvmStatic
+    val passiveShaderList: Array<String?>
+        external get
+}