fix(android): possible NullPointerException (#965)

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

 
   @ReactProp(name = "androidHardwareAccelerationDisabled")
   public void setHardwareAccelerationDisabled(WebView view, boolean disabled) {
-    ReactContext reactContext = (ReactContext) view.getContext();
-    final boolean isHardwareAccelerated = (reactContext.getCurrentActivity().getWindow()
-        .getAttributes().flags & WindowManager.LayoutParams.FLAG_HARDWARE_ACCELERATED) != 0;
-    if (disabled || !isHardwareAccelerated) {
+    if (disabled) {
       view.setLayerType(View.LAYER_TYPE_SOFTWARE, null);
-    } else {
-      view.setLayerType(View.LAYER_TYPE_HARDWARE, null);
     }
   }