Fix the Android implementation to return a file path, not an Uri path

android/src/main/java/fr/greweb/reactnativeviewshot/ViewShot.java

             if ("file".equals(result)) {
                 os = new FileOutputStream(output);
                 captureView(view, os);
-                String uri = Uri.fromFile(output).toString();
-                promise.resolve(uri);
+                promise.resolve(output.getAbsolutePath());
             }
             else if ("base64".equals(result)) {
                 os = new ByteArrayOutputStream();