fix(android): updating source.html prop doesn't refresh webview (#485)

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

     if (source != null) {
       if (source.hasKey("html")) {
         String html = source.getString("html");
-        if (source.hasKey("baseUrl")) {
-          view.loadDataWithBaseURL(
-            source.getString("baseUrl"), html, HTML_MIME_TYPE, HTML_ENCODING, null);
-        } else {
-          view.loadData(html, HTML_MIME_TYPE + "; charset=" + HTML_ENCODING, null);
-        }
+        String baseUrl = source.hasKey("baseUrl") ? source.getString("baseUrl") : "";
+        view.loadDataWithBaseURL(baseUrl, html, HTML_MIME_TYPE, HTML_ENCODING, null);
         return;
       }
       if (source.hasKey("uri")) {