Migrated media/zoomControllers package to kotlin

Author: Saifuddin53

app/src/main/java/fr/free/nrw/commons/media/ZoomableActivity.kt

@@ -272,7 +272,7 @@ class ZoomableActivity : BaseActivity() {
      * Handles down swipe action
      */
     private fun onDownSwiped() {
-        if (binding.zoomable.zoomableController?.isIdentity == false) {
+        if (!binding.zoomable.getZoomableController().isIdentity()) {
             return
         }
 
@@ -342,7 +342,7 @@ class ZoomableActivity : BaseActivity() {
      * Handles up swipe action
      */
     private fun onUpSwiped() {
-        if (binding.zoomable.zoomableController?.isIdentity == false) {
+        if (!binding.zoomable.getZoomableController().isIdentity()) {
             return
         }
 
@@ -415,7 +415,7 @@ class ZoomableActivity : BaseActivity() {
      * Handles right swipe action
      */
     private fun onRightSwiped(showAlreadyActionedImages: Boolean) {
-        if (binding.zoomable.zoomableController?.isIdentity == false) {
+        if (!binding.zoomable.getZoomableController().isIdentity()) {
             return
         }
 
@@ -452,7 +452,7 @@ class ZoomableActivity : BaseActivity() {
      * Handles left swipe action
      */
     private fun onLeftSwiped(showAlreadyActionedImages: Boolean) {
-        if (binding.zoomable.zoomableController?.isIdentity == false) {
+        if (!binding.zoomable.getZoomableController().isIdentity()) {
             return
         }