fix(android): Fixes black screen on back button press (#1298 by @michan85)

Co-authored-by: michael hancock <michael.hancock@24.com>
Co-authored-by: Jamon Holmgren <jamonholmgren@gmail.com>

android/src/main/java/com/reactnativecommunity/webview/RNCWebViewManager.java

@@ -1234,6 +1234,21 @@ public class RNCWebViewManager extends SimpleViewManager<WebView> {
       destroy();
     }
 
+    WebChromeClient mWebChromeClient;
+    @Override
+    public void setWebChromeClient(WebChromeClient client) {
+      this.mWebChromeClient = client;
+      super.setWebChromeClient(client);
+    }
+
+    @Override
+    public void destroy() {
+      if(mWebChromeClient!=null){
+        mWebChromeClient.onHideCustomView();
+      }
+      super.destroy();
+    }
+
     protected class RNCWebViewBridge {
       RNCWebView mContext;