Removed unnecessary media ID not required for current fullscreen impl…

…ementation.

WordPressEditor/src/main/java/org/wordpress/android/editor/EditorImagePreviewListener.java

@@ -1,5 +1,5 @@
 package org.wordpress.android.editor;
 
 public interface EditorImagePreviewListener {
-    void onImagePreviewRequested(int mediaId, String mediaSource);
+    void onImagePreviewRequested(String mediaSource);
 }

WordPressEditor/src/main/java/org/wordpress/android/editor/GutenbergContainerFragment.java

@@ -50,7 +50,8 @@ public void attachToContainer(ViewGroup viewGroup, OnMediaLibraryButtonListener
                                   OnAuthHeaderRequestedListener onAuthHeaderRequestedListener,
                                   OnImageFullscreenPreviewListener onImageFullscreenPreviewListener) {
         mWPAndroidGlueCode.attachToContainer(viewGroup, onMediaLibraryButtonListener, onReattachQueryListener,
-                onEditorMountListener, onEditorAutosaveListener, onAuthHeaderRequestedListener, onImageFullscreenPreviewListener);
+                onEditorMountListener, onEditorAutosaveListener, onAuthHeaderRequestedListener,
+                onImageFullscreenPreviewListener);
     }
 
     @Override

WordPressEditor/src/main/java/org/wordpress/android/editor/GutenbergEditorFragment.java

@@ -330,8 +330,8 @@ public void run() {
                     }
                 },
                 new OnImageFullscreenPreviewListener() {
-                    @Override public void onImageFullscreenPreviewClicked(int mediaId, String mediaSource) {
-                        mEditorImagePreviewListener.onImagePreviewRequested(mediaId, mediaSource);
+                    @Override public void onImageFullscreenPreviewClicked(String mediaSource) {
+                        mEditorImagePreviewListener.onImagePreviewRequested(mediaSource);
                     }
                 });